Input Unit  Input Unit Devices Input Unit Devices  The task of Input Unit is very simple – to input data into the computer. All the devices that somehow enter data in computer are input devices. We type into keyboard to enter data, click on mouse to issue commands (input commands into computers), scan images, record voice, shoot video and many ways a computer gets data into it. So, keyboard, mouse, light pen, joystick, microphone, web cam, video camera etc. all are input unit device. If we look a bit deeper, it is the input unit that accepts the user data, converts it in suitable form (string of binary digits) –known as encoding – so that it can be used by computer