Input devices are necessary to enter data and instructions into a computer. An input device converts input data and instructions into suitable binary form(such as ASCII) which can be accepted by the computer. The commonly used input device is a keyboard. A number of input devices such as mouse, light pen, graphic tablet, joy stick, track nall, touch screen etc have also been developed which do not require typing for inputting information. In recent days voice input systems have also been developed and microphone is used for that purpose.
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