HTML TAGS:

For learning HTML following heading very important because these are basic information of HTML. Therefore read carefully and understand every part of this chapter.......

HTML TAGS:


    Tags contain elements which provide instructions for how information will be processed or displayed. There are both starter tags <TAG> and end tags </TAGS>

Element:

    A basic unit of an HTML document. The name of the element is given in the name of the tag, and specifies the meaning associated with a block of text. Some elements are empty since they don't effect a block of text. Elements that have contents are also called containers, i.e., they contain attributes.
    • Example: the <HR> tag contains the Horizontal Ruler element. It is an empty element in that it has no attribute.

    Attribute:

      Defines a special property of an HTML element.
      • Example: <IMG SRC="image.gif"> means that the element IMG has an attribute SRC, which specifies the name of the image file, which is assigned the value "image.gif".

      Delimiters: <, >, /

        Delimiters surround the tag and inform the parser that it should read the enclosed information as an HTML element.

      HTML Structure

      HTML is a structured hierarchical language that requires you to follow its rules if you wish your documents to appear correctly. For example, certain elements and tags are required to fit within other elements and tags and will not work unless they are properly placed.




      Website Design

      Website Design

      Web design encompasses many different skills and disciplines in the production and maintenance of websites. The different areas of web design include web graphic design; interface design; authoring, including standardised code and proprietary software; user experience design; and search engine optimization. Often many individuals will work in teams covering different aspects of the design process, although some designers will cover them all. The term web design is normally used to describe the design process relating to the front-end (client side) design of a website including writing mark up. Web design partially overlaps web engineering in the broader scope of web development. Web designers are expected to have an awareness of usability and if their role involves creating mark up then they are also expected to be up to date with web accessibility guidelines.
      In 1989, whilst working at CERN Tim Berners-Lee proposed to create a global hypertext project, which later became known as the World Wide Web. During 1991 to 1993 the World Wide Web was born. Text-only pages could be viewed using a simple line-mode browser. In 1993 Marc Andreessen and Eric Bina, created the Mosaic browser. At the time there were multiple browsers, however the majority of them were Unix-based and naturally text heavy. There had been no integrated approach to graphic design elements such as images or sounds. The Mosaic browser broke this mould. The W3C was created in October 1994 to "lead the World Wide Web to its full potential by developing common protocols that promote its evolution and ensure its interoperability." This discouraged any one company from monopolizing a propriety browser and programming language, which could have altered the effect of the World Wide Web as a whole. The W3C continues to set standards, which can today be seen with JavaScript. In 1994 Andreessen formed Communications Corp. that later became known as Netscape Communications, the Netscape 0.9 browser. Netscape created its own HTML tags without regard to the traditional standards process. For example, Netscape 1.1 included tags for changing background colours and formatting text with tables on web pages. Throughout 1996 to 1999 the browser wars began, as Microsoft and Netscape fought for ultimate browser dominance. During this time there were many new technologies in the field, notably Cascading Style Sheets, JavaScript, and Dynamic HTML. On the whole, the browser competition did lead to many positive creations and helped web design evolve at a rapid pace

      WEB Development

      WEB Development

      Web development is a broad term for the work involved in developing a web site for the Internet (World Wide Web) or an intranet (a private network). Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services. A more comprehensive list of tasks to which web development commonly refers, may include web engineering, web design, web content development, client liaison, client-side/server-side scripting, web server and network security configuration, and e-commerce development. Among web professionals, "web development" usually refers to the main non-design aspects of building web sites: writing markup and coding. Most recently Web development has come to mean the creation of content management systems or CMS. These CMS can be made from scratch, proprietary or open source. In broad terms the CMS acts as middleware between the database and the user through the browser. A principle benefit of a CMS is that it allows non-technical people to make changes to their web site without having technical knowledge.

      For larger organizations and businesses, web development teams can consist of hundreds of people (web developers) and follow standard methods like Agile methodologies while developing websites. Smaller organizations may only require a single permanent or contracting developer, or secondary assignment to related job positions such as a graphic designer and/or information systems technician. Web development may be a collaborative effort between departments rather than the domain of a designated department. There are 3 kind of web developer specialization; Front-End Developer, Back-End Developer, and Full Stack Developer.

      wordpress

      WORDPRESS

      WordPress is a free and open-source content management system (CMS) based on PHP and MySQL. WordPress is installed on a web server
      , which either is part of an Internet hosting service or is a network host itself; the first case may be on a service like WordPress.com, for example, and the second case is a computer running the software package WordPress.org. An example of the second case is a local computer configured to act as its own web server hosting WordPress for single-user testing or learning purposes. Features include a plugin architecture and a template system. WordPress was used by more than 26.4% of the top 10 million websites as of April 2016. WordPress is reportedly the easiest and most popular website management or blogging system in use on the Web, supporting more than 60 million websites.
      It was released on May 27, 2003, by its founders, Matt Mullenweg and Mike Little, as a fork of b2/cafelog. WordPress is released under the GPLv2 (or later) license from the Free Software Foundation.

      php

      PHP

      PHP is a server-side scripting language designed primarily for web development but also used as a general-purpose programming language. Originally created by Rasmus Lerdorf in 1994, the PHP reference implementation is now produced by The PHP Development Team. PHP originally stood for Personal Home Page, but it now stands for the recursive acronym PHP: Hypertext Preprocessor.
      PHP code may be embedded into HTML code, or it can be used in combination with various web template systems, web content management systems and web frameworks. PHP code is usually processed by a PHP interpreter implemented as a module in the web server or as a Common Gateway Interface (CGI) executable. The web server combines the results of the interpreted and executed PHP code, which may be any type of data, including images, with the generated web page. PHP code may also be executed with a command-line interface (CLI) and can be used to implement standalone graphical applications.
      The standard PHP interpreter, powered by the Zend Engine, is free software released under the PHP License. PHP has been widely ported and can be deployed on most web servers on almost every operating system and platform, free of charge.
      The PHP language evolved without a written formal specification or standard until 2014, leaving the canonical PHP interpreter as a de facto standard. Since 2014 work has gone on to create a formal PHP specification.
      During the 2010s there have been increased efforts towards standardisation and code sharing in PHP applications by projects such as PHP-FIG in the form of PSR-initiatives as well as Composer dependency manager and the Packagist repository.

      jquery

      JQUERY

      jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML. jQuery is the most popular JavaScript library in use today, with installation on 65% of the top 10 million highest-trafficked sites on the Web. jQuery is free, open-source software licensed under the MIT License.
      jQuery's syntax is designed to make it easier to navigate a document, select DOM elements, create animations, handle events, and develop Ajax applications. jQuery also provides capabilities for developers to create plug-ins on top of the JavaScript library. This enables developers to create abstractions for low-level interaction and animation, advanced effects and high-level, themeable widgets. The modular approach to the jQuery library allows the creation of powerful dynamic web pages and Web applications.
      The set of jQuery core features—DOM element selections, traversal and manipulation—enabled by its selector engine(named "Sizzle" from v1.3), created a new "programming style", fusing algorithms and DOM data structures. This style influenced the architecture of other JavaScript frameworks like YUI v3 and Dojo, later stimulating the creation of the standard Selectors API.
      Microsoft and Nokia bundle jQuery on their platforms. Microsoft includes it with Visual Studio for use within Microsoft's ASP.NET AJAX and ASP.NET MVC frameworks while Nokia has integrated it into the Web Run-Time widget development platform. jQuery has also been used in MediaWiki since version 1.16.

      CSS(Cascading Style Sheets)

      CSS(Cascading Style Sheets)

      Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language. Although most often used to set the visual style of web pages and user interfaces written in HTML and XHTML, the language can be applied to any XML document, including plain XMLSVG and XUL, and is applicable to rendering in speech, or on other media. Along with HTML and JavaScript, CSS is a cornerstone technology used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications.
      CSS is designed primarily to enable the separation of document content from document presentation, including aspects such as the layout, colors, and fonts. This separation can improve content accessibility, provide more flexibility and control in the specification of presentation characteristics, enable multiple HTML pages to share formatting by specifying the relevant CSS in a separate .css file, and reduce complexity and repetition in the structural content.
      Separation of formatting and content makes it possible to present the same markup page in different styles for different rendering methods, such as on-screen, in print, by voice (via speech-based browser or screen reader), and on Braille-based tactile devices. It can also display the web page differently depending on the screen size or viewing device. Readers can also specify a different style sheet, such as a CSS file stored on their own computer, to override the one the author specified.
      Changes to the graphic design of a document (or hundreds of documents) can be applied quickly and easily, by editing a few lines in the CSS file they use, rather than by changing markup in the documents.
      The CSS specification describes a priority scheme to determine which style rules apply if more than one rule matches against a particular element. In this so-called cascade, priorities (or weights) are calculated and assigned to rules, so that the results are predictable.
      The CSS specifications are maintained by the World Wide Web Consortium (W3C). Internet media type (MIME type) text/css is registered for use with CSS by  (March 1998). The W3C operates a free CSS validation service for CSS documents,

      HTML(Hyper Text Markup Language)

      HTML(Hyper Text Markup Language)

      Hyper Text Markup Language (HTML) is the standard markup language for creating web pages and web applications. With Cascading Style Sheets (CSS), and JavaScript, it forms a triad of cornerstone technologies for the World Wide Web. Web browsers receive HTML documents from a web server or from local storage and render them into multimedia web pages. HTML describes the structure of a web page semantically and originally included cues for the appearance of the document.
      HTML elements are the building blocks of HTML pages. With HTML constructs, images and other objects, such as interactive forms may be embedded into the rendered page. It provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes and other items. HTML elements are delineated by tags, written using angle brackets. Tags such as <img /> and <input /> introduce content into the page directly. Others such as <p>...</p> surround and provide information about document text and may include other tags as sub-elements. Browsers do not display the HTML tags, but use them to interpret the content of the page.
      HTML can embed programs written in a scripting language such as JavaScript which affect the behavior and content of web pages. Inclusion of CSS defines the look and layout of content. The World Wide Web Consortium (W3C), maintainer of both the HTML and the CSS standards, has encouraged the use of CSS over explicit presentation  HTML since 1997
      Some tags of HTML.
      • <H1> For Heading </H1>
      • <A> For LINK </A>
      • <IMG> IMAGES
      • <P> PARAGRAPH </P>
      • <INPUT> TEXT BOX
      • <BR> LINE BREAK </BR>

      COMPUTER PROGRAMMING LANGUAGE

      COMPUTER PROGRAMMING LANGUAGE

      programming language is a formal computer language designed to communicate instructions to a machine, particularly a computer. Programming languages can be used to create programs to control the behavior of a machine or to express algorithms.
      The earliest known programmable machine preceded the invention of the digital computer and is the automatic flute player described in the 9th century by the brothers Musa in Baghdad, "during the Islamic Golden Age". From the early 1800s, "programs" were used to direct the behavior of machines such as Jacquard looms and player pianos. Thousands of different programming languages have been created, mainly in the computer field, and many more still are being created every year. Many programming languages require computation to be specified in an imperative form (i.e., as a sequence of operations to perform), while other languages use other forms of program specification such as the declarative form (i.e. the desired result is specified, not how to achieve it).The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning). Some languages are defined by a specification document (for example, the C programming language is specified by an ISO Standard), while other languages (such as Perl) have a dominant implementation that is treated as a reference. Some languages have both, with the basic language defined by a standard and extensions taken from the dominant implementation being common.
      • Java. Java is considered as the perfect language for the developers and programmers to learn. ...
      • PHP. ...
      • JavaScript. ...
      • Python. ...
      • Objective-C. ...
      • Ruby. ...
      • Perl. ...
      • C, C++ and C#

      COMPUTER SOFTWARE

      COMPUTER SOFTWARE


      Computer software, or simply software, is that part of a computer system that consists of encoded information or computer instructions, in contrast to the physical hardware from which the system is built.
      The term "software" was first proposed by Alan Turing and used in this sense by John W. Tukey in 1957. In computer science and software engineering, computer software is all information processed by computer systems, programs and data.
      Computer software includes computer programs, libraries and related non-executable data, such as online documentation or digital media. Computer hardware and software require each other and
      neither can be realistically used on its own.
      At the lowest level, executable code consists of machine language instructions specific to an individual processor—typically a central processing unit (CPU). A machine language consists of groups of binary values signifying processor instructions that change the state of the computer from its preceding state. For example, an instruction may change the value stored in a particular storage location in the computer—an effect that is not directly observable to the user. An instruction may also (indirectly) cause something to appear on a display of the computer system—a state change which should be visible to the user. The processor carries out the instructions in the order they are provided, unless it is instructed to "jump" to a different instruction, or is interrupted.
      The majority of software is written in high-level programming languages that are easier and more efficient for programmers, meaning closer to a natural language. High-level languages are translated into machine language using a compiler or an interpreter or a combination of the two. Software may also be written in a low-level assembly language, essentially, a vaguely mnemonic representation of a machine language using a natural language alphabet, which is translated into machine language using an assembler.

      COMPUTER LANGUAGE

      COMPUTER LANGUAGE

      • Programming language, a formal language designed to communicate instructions to a machine, particularly a computer .
      • Command language, a language used to control the tasks of the computer itself, such as starting other programs
      • Machine language or machine code, a set of instructions executed directly by a computer's central processing unit
      • Markup language, a grammar for annotating a document in a way that is syntactically distinguishable from the text, such as HTML
      • Style sheet language, a computer language that expresses the presentation of structured documents, such as CSS
      • Configuration language, a language used to write configuration files
      • Construction language, a general category that includes configuration languages, toolkit languages, and programming languages
      • Query language, a language used to make queries in databases and information systems
      • Modeling language, a formal language used to express information or knowledge, often for use in computer system design

      computer network

      COMPUTER NETWORK


      computer network or data network is a telecommunications network which allows computers to exchange data. In computer networks, networked computing devices exchange data with each other using a data link. The connections between nodes are established using either cable media or wireless media. The best-known computer network is the Internet.
      Network computer devices that originate, route and terminate the data are called network nodes. Nodes computers, phones, servers as well as networking hardware. Two such devices can be said to be networked together when one device is able to exchange information with the other device, whether or not they have a direct connection to each other.
      can include hosts such as personal
      Computer networks differ in the transmission medium used to carry their signals, communications protocols to organize network traffic, the network's size, topology and organizational intent.
      Computer networks support an enormous number of applications and services such as access to the World Wide Web, digital video, digital audio, shared use of application and storage servers, printers, and fax machines, and use of email and instant messaging applications as well as many others. In most cases, application-specific communications protocols are layered(i.e. carried as payload) over other more general communications protocols

      Disadvantages of internet

      Disadvantages of internet


      1. There is a lot of wrong information on the internet. Anyone can post anything, and much of it is garbage. 
      2.  There are predators that hang out on the internet waiting to get unsuspecting people in dangerous situations. 
      3.  Some people are getting addicted to the internet and thus causing problems with their interactions of friends and loved ones. 
      4.  Pornography that can get in the hands of young children too easily. 
      5.  Easy to waste a lot of time on the internet. You can start surfing, and then realize far more time has passed than you realized. Internet and television together of added to the more sedentary lifestyles of people which further exacerbates the obesity problem. 

      6.  Internet has a lot of "cheater" sites. People can buy essays and pass them off as their own far more easily than they used to be able to do. 
      7.  There are a lot of unscrupulous businesses that have sprung up on the internet to take advantage of people. 
      8.  Hackers can create viruses that can get into your personal computer and ruin valuable data. 
      9.  Hackers can use the internet for identity theft. 
      10.  It can be quite depressing to be on the internet and realize just how uneducated so many people have become in today's society.

      disadvantages of computer

      disadvantages of computer




      Computers make it extremely easy to store and access data, but their increasing use has led to an extreme level of dependence on them, which can create a number of problems if and when computers malfunction. A power outage can render entire businesses or institutions essentially inoperable without the use of computers. Data that is stored on computers can also be lost permanently if not backed up properly, and back up methods are not entirely dependable.
      In a similar vein, personal data stored on computers is often extremely vulnerable to digital theft. Data regarding bank accounts, credit cards, social security numbers and more is commonly transmitted online, and security protocols to protect this data are not always effective.

      Computers also create the added potential for distraction. The sheer amount of content on the Internet makes it possible to spend almost limitless time browsing blogs, playing games or chatting with friends. This can dramatically detract from productivity, whether it's at work, in school or at home. Computers can also hinder social interactions. Many users are often distracted from real life interactions by the draw of computers, diminishing social relationships.

      advantages of computer

      Advantages of computer

      Computer has made a very vital impact on society. It has changed the way of life. The use of computer technology has affected every field of life. People are using computers to perform different tasks quickly and easily. The use of computers makes different task easier. It also saves time and effort and reduces the overall cost to complete a particular task.
      Many organizations are using computers for keeping the records of their customers. Banks are using computers for maintaining accounts and managing financial transactions. The banks are also providing the facility of online banking. The customers can check their account balance from using the internet. They can also make financial transaction online. The transactions are handled easily and quickly with computerized systems.
      People are using computers for paying their bills, managing their home budgets or simply having some break and watching a movie, listening to songs or playing computer games. Online services like skype or social media websites are used for communication and information sharing purposes.

      Information Technology (IT)

      Information Technology (IT)

      Information technology (IT) is the application of computers and internet to store, retrieve, transmit, and manipulate data,or information, often in the context of a business or other enterprise. IT is considered a subset of information and communications technology (ICT). In 2012, Zuppo proposed an ICT hierarchy where each hierarchy level "contain some degree of commonality in that they are related to technologies that facilitate the transfer of information and various types of electronically mediated communications." Business/IT was one level of the ICT hierarchy.
      The term is commonly used as a synonym for computers and computer networks, but it also encompasses other information distribution technologies such as television and telephones. Several industries are associated with information technology, including computer hardware, software, electronics, semiconductors, internet, telecom equipment, engineering, healthcare, e-commerce, and computer services.
      Humans have been storing, retrieving, manipulating, and communicating information since the Sumerians in Mesopotamia developed writing in about 3000 BC, but the term information technology in its modern sense first appeared in a 1958 article published in the Harvard Business Review; authors Harold J. Leavitt and Thomas L. Whisler commented that "the new technology does not yet have a single established name. We shall call it information technology (IT)." Their definition consists of three categories: techniques for processing, the application of statistical and mathematical methods to decision-making, and the simulation of higher-order thinking through computer programs.
      Based on the storage and processing technologies employed, it is possible to distinguish four distinct phases of IT development: pre-mechanical (3000 BC – 1450 AD), mechanical (1450–1840), electromechanical (18401940), electronic (1940–present),and moreover, IT as a service. This article focuses on the most recent period (electronic), which began in about 1940.

      What Is AngularJS?

      What Is AngularJS?


       AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. AngularJS's data binding and dependency injection eliminate much of the code you would otherwise have to write. And it all happens within the browser, making it an ideal partner with any server technology.
      AngularJS is what HTML would have been, had it been designed for applications. HTML is a great declarative language for static documents. It does not contain much in the way of creating applications, and as a result building web applications is an exercise in what do I have to do to trick the browser into doing what I want?
      The impedance mismatch between dynamic applications and static documents is often solved with:
      • a library - a collection of functions which are useful when writing web apps. Your code is in charge and it calls into the library when it sees fit. E.g., jQuery.
      • frameworks - a particular implementation of a web application, where your code fills in the details. The framework is in charge and it calls into your code when it needs something app specific. E.g., durandalember, etc.
      AngularJS takes another approach. It attempts to minimize the impedance mismatch between document centric HTML and what an application needs by creating new HTML constructs. AngularJS teaches the browser new syntax through a construct we call directives. Examples include:
      • Data binding, as in {{}}.
      • DOM control structures for repeating, showing and hiding DOM fragments.
      • Support for forms and form validation.
      • Attaching new behavior to DOM elements, such as DOM event handling.
      • Grouping of HTML into reusable components.

      computer entertainment

      Computer Entertainment


      subhanAllah


      In this pic we use graphic designing .
      this is very beautiful animation.



      Internet

      Internet

      The Internet, sometimes called simply "the Net," is a worldwide system of computer networks - a network of networks in which users at any one computer can, if they have permission, get information from any other computer (and sometimes talk directly to users at other computers). It was conceived by the Advanced Research Projects Agency (ARPA) of the U.S. government in 1969 and was first known as the ARPANet. The original aim was to create a network that would allow users of a research computer at one university to "talk to" research computers at other universities. A side benefit of ARPANet's design was that, because messages could be routed or rerouted in more than one direction, the network could continue to function even if parts of it were destroyed in the event of a military attack or other disaster.
      sample
      The origins of the Internet date back to research commissioned by the United States federal government in the 1960s to build robust, fault-tolerant communication via computer networks. The primary precursor network, the ARPANET, initially served as a backbone for interconnection of regional academic and military networks in the 1980s. The funding of the National Science Foundation Network as a new backbone in the 1980s, as well as private funding for other commercial extensions, led to worldwide participation in the development of new networking technologies, and the merger of many networks. The linking of commercial networks and enterprises by the early 1990s marks the beginning of the transition to the modern Internet,and generated a sustained exponential growth as generations of institutional, personal, and mobile computers were connected to the network. Although the Internet was widely used by academia since the 1980s, the commercialization incorporated its services and technologies into virtually every aspect of modern life

      INTEL vs AMD (Processor)


      INTEL vs AMD (Processor)

      Explain two different type processor in your pc.

      microprocessor

      Microprocessor

      microprocessor is a computer processor which incorporates the functions of a computer's central processing unit (CPU) on a single integrated circuit (IC),or at most a few integrated circuits. The microprocessor is a multipurpose, clock driven, register based, programmable electronic device which accepts digital or binary data as input, processes it according to instructions stored in its memory, and provides results as output. Microprocessors contain both combinational logic and sequential digital logic. Microprocessors operate on numbers and symbols represented in the binary numeral system.
      The integration of a whole CPU onto a single chip or on a few chips greatly reduced the cost of processing power. Integrated circuit processors are produced in large numbers by highly automated processes resulting in a low per unit cost. Single-chip processors increase reliability as there are many fewer electrical connections to fail. As microprocessor designs get faster, the cost of manufacturing a chip (with smaller components built on a semiconductor chip the same size) generally stays the same.

      monitor and lcd

      Monitor


      computer monitor or a computer display is an electronic visual display for computers. A monitor utransistor liquid crystal display (TFT-LCD) or a flat panel LED display, while older monitors used a cathode ray tubes (CRT). It can be connected to the computer_via VGA, DVI, HDMI, DisplayPort, Thunderbolt, LVDS (Low-voltage differential signaling) or other proprietary connectors and signals.sually comprises the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin filmOriginally, computer monitors were used for data processing while television receivers were used for entertainment. From the 1980s onwards, computers (and their monitors) have been used for both data processing and entertainment, while televisions have implemented some computer functionality. The common aspect ratio of televisions, and computer monitors, has changed from 4:3 to 16:10, to 16:9.

      LCD(liquid crystal display)

      A liquid crystal display (LCD) monitor is a computer monitor or display that uses LCD technology to show clear images, and is found mostly in laptop computers and flat panel monitors. This technology has replaced the traditional cathode ray tube (CRT) monitors, which were the previous standard and once were considered to have better picture quality than early LCD variants. With the introduction of better LCD technology and its continuous improvement, LCD is now the clear leader over CRT, in terms of color and picture quality, not to mention capabilities for large resolutions. Also, LCD monitors may be made much more cheaply than CRT monitors

      Mouse and Keyboard

      Mouse

         Mouse is the item of computer hardware. For the pointer it controls, see Pointer (user interface).Physically, a mouse consists of an object held in one's hand, with one or more buttons. Mice often also feature other elements, such as touch surfaces and "wheels", which enable additional control and dimensional input.
      computer mouse is a pointing device (hand control) that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows a smooth control of the graphical user interface. A computer mouse with the most common standard features: two buttons (left and right) and a scroll wheel,which can also act as a third button.

             Keyboard

            Keyboard is the item of computer hardware. A computer keyboard is a typewriter-style device which uses an arrangement of buttons or keys to act as a mechanical lever or electronic switch. Following the decline of punch cards and paper tape, interaction via teleprinter-style keyboards became the main input device for computers.
      The standard US Qwerty keyboard has 101104 or 107 keys. Of those keys they can (by default) produce 96 unique characters. Additional characters can sometimes be produced using "alt codes" but support is not standard nor guaranteed. Hold Alt type [3 digit or 4 digit number] release alt.

      Main memory

      Main memory

      Explain to video clip...............................................................................................


      Main memory


      Main memory

      The computer can manipulate only data that is in main memory. Therefore, every program you execute and every file you access must be copied from a storage device into main memory.
      Main memory are two types. Types are following. 


        1. ROM(Read only memory)
        2. RAM(Random access memory)
        1. ROM
        sample(9)
                       ROM stand for read only memory .ROM is a type of storage medium that permanently stores data on personal computers (PCs) and other electronic devices. It contains the programming needed to start a PC, which is essential for boot-up; it performs major input/output tasks and holds programs or software instructions.
        The types of ROM are following.
        1. EROM
        2. EPROM
        3. EEPROM
        4. FLASH EEPROM
        2. RAM
                      RAM stand for random access memory . RAM  is the place in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device's processor. RAM is much faster to read from and write to than other kinds of storage in a computer, such as a hard disk drive (HDD), solid-state drive (SSD) or optical drive. Data remains in RAM as long as the computer is running. When the computer is turned off, RAM loses its data. When the computer is turned on again, the OS and other files are once again loaded into RAM, usually from an HDD or SSD .
        The types of RAM are following.
        1. STATIC RAM
        2. DYNAMIC RAM

        Motherboard

        Motherboard

        Motherboard or system board is a main circuit board. All the computer components are plugged or connected with it.
        sample(5)
        motherboard (sometimes alternatively known as the main boardsystem boardbaseboardplanar board or logic board,or colloquially, a mobo) is the main printed circuit board (PCB) found in general purpose microcomputers and other expandable systems. It holds and allows communication between many of the crucial electronic components of a system, such as the central processing unit (CPU) and memory, and provides connectors for other peripherals. Unlike a back plane, a motherboard usually contains significant sub-systems such as the central processor, the chip set's input/output and memory controllers, interface connectors, and other components integrated for general purpose use.
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        Following ar some of the hardware components attached to the motherboard.


        1. Processor
        2. Input/output devices
        3. Memory chips (RAM ,ROM)
        4. Expansion cards
        5. Expansion slots
        6. Storage devices

        Computer basic component

        Computer basic components

                       Computers are made of the following basic components.

          1. Power Supply- The power supply comes with the case, but this component is mentioned separately since there are various types of power supplies. The one you should get depends on the requirements of your system. This will be discussed in more detail later
          2. Motherboard- This is where the core components of your computer reside which are listed below. Also the support cards for video, sound, networking and more are mounted into this board. Microprocessor , Memory

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            Hard disk drive- This is where your files are permanently stored on your computer. Also, normally, your operating system is installed here.
            CD-ROM drive, Floppy drive
          4. Monitor- This device which operates like a TV set lets the user see how the computer is responding to their commands.
          5. Keyboard- This is where the user enters text commands into the computer.
          6. Mouse- A point and click interface for entering commands which works well in graphical environments.

        Central Processing Unit(CPU)

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        Central Processing Unit(CPU)


        The
        CPU (Central Processing Unit) is the part of a  computer system that is commonly referred to as the "brains" of a computer. The CPU is also known as the processor (intel) or microprocessor (AMD). The CPU is responsible for executing a sequence of stored instructions called a program.



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        CPU is the electronic machine within a computer that carries out the instruction of a computer program by performing the basic arithmeticlogicalcontrol and input/output (I/O) operations specified by the instructions. The term has been used in the computer industry at least since the early 1960s .Traditionally, the term CPU refers to a processor, more specifically to its processing unit and control unit (CU), distinguishing these core elements of a computer from external components such as main memory and I/O circuitry



        introduction of computer

        A video introduction of computer                                         very useful information in this video.                      ...