Input device Input device is a device through which data and instruction are entered into computer system. An input devices converts the data and instructions into binary form that computer can understand. This transformation is performed by “Input interface”. The data entered through input device can be some text, some graphical image or symbol, sound etc, depending on the form of the raw data the various input devices are available. Basic Function Performed by Input unit of a computer system - 1. It accepts the instruction and data from the user. 2. It converts these instruction and data in computer acceptable form. 3. It supplies the converted instruction and data to the computer system for further processing. Some of the commonly input devices used are:- 1. Keyboard 2. Mouse 3. Joy stick 4. Track ball 5. Touch screen 6. Light Pen 7. Digitizer 8. Scanner 9. Speech Recognition Devices 1. Keyboard Keyboard is an input device for enteri...