Any device connected internally or externally to a computer and used to enter or display data, such as the keyboard, mouse, monitor, scanner, and printer.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
peripheral
Any input, output or storage device connected externally or internally to the computer's CPU, such as a monitor, keyboard, mouse, printer, hard disk, graphics tablet, scanner, joystick or paddle. Pronounced "per-if-uh-rul." See peripheral bus.
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