RGB (Red, Green, Blue)

Css Color

Colors in CSS are most often specified by:

• a valid color name - like "red"
• an RGB value - like "rgb(255, 0, 0)"
• a HEX value - like "#ff0000"

Note: Color names are case-insensitive: "Red" is the same as "red" or "RED".

RGB (Red, Green, Blue)

RGB color values can be specified using this formula: rgb(red, green, blue).

Each parameter (red, green, blue) defines the intensity of the color between 0 and 255.

For example, rgb(255,0,0) is displayed as red, because red is set to its highest value (255) and the others are set to 0. Experiment by mixing the RGB values

Hexadecimal Colors

RGB values can also be specified using hexadecimal color values in the form: #RRGGBB, where RR (red), GG (green) and BB (blue) are hexadecimal values between 00 and FF

(same as decimal 0-255).

For example, #FF0000 is displayed as red, because red is set to its highest value (FF) and the others are set to the lowest value (00). 

Note: HEX values are case-insensitive: "#ff0000" is the same as "FF0000".
this is very important for css because color are use in css many times.
therefore read this chapter two three time for making color schemes ................

Advantages and Disadvantages of internet

Advantages and Disadvantages of internet

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.

computer entertainment

Computer Entertainment

subhanAllah


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

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.
A 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 101, 104 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

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               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.

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A motherboard (sometimes alternatively known as the main board, system board, baseboard, planar 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

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 arithmetic, logical, control 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