Input Unit
The input devices are used to enter data to the computer system.There are many types of input devices depending on the nature of data to be entered.Key board is one of the most commonly used input device.It is used for alphanumeric data entry.Mouse is another common input device used to locate screen positions.There are also unusual input device that respond to voices and touch.The input device is also responsible for translation of data to a form that the computer system can understand
Input Devices :
An input devices is any machine that is used to feed into the computer.Some of them are general purpose, that is they are used by all computers where as some others are special purpose which are used to input data in a specific way.Key board and Mouse can be considered as general purpose and special purpose input devices are optical mark readers, optical character readers, optical character readers and track ball.
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