Input device is any peripheral piece of computer hardware equipment to provide data and control signals to an information processing system such as a computer or other information appliance.
Input device Translate data from form that humans understand to one that the computer can work with.
Example of Input Devices:-
Mouse (pointing device)
Video Capture Hardware
An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) which converts the electronically generated information into human readable form.