In computer systems, there are two types of devices: the
input devices and the output devices. The input devices sends data or information
to the computer system for processing while the output devices display or
reproduce the result of the processing.
A device can either be both which is called I/O device.
Best examples for input devices are the mouse and the
keyboard. Examples of output are the computer monitors, speakers, and
projectors. For I/O device, a USB flash drive is a best example.
