A keyboard is one of the most common input devices used with computer. It allows the user to key in program and data and to control the computer system. The alphabetic and numeric key in program are arranged in the same order as a type writer. This layout is known as QWERTY because these are the first six letters on the top left of the keyboard.
Letters, number, symbol, and blank spaces are known as characters. Computer keyboard have all the characters found and typewriters. In addition, they have some extra characters and some keys that do not produce characters but have special uses,
As with electric typewriters, most keys are auto-repeating. This means that, if they are held down, they repeat the same function again and again until they are released.
Unlike a typewriter, when using a computer keyboard, it is particularly important not o confuse the number 0 key with the letter 0 key and the number 1 with the letter L.
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