A peripheral device is a piece of computer hardware that is added to a host computer. Peripheral devices can be external in order to expand its abilities such as a mouse, keyboard, printer, monitor, joysticks, or scanner, or can be internal such as a CD-ROM drive, CD-R drive or internal modem. Internal peripheral devices are often referred to as integrated peripherals.
Devices such as monitors and disk drives are not considered peripherals when they are not truly optional.
Peripheral devices are classified according to the purpose they serve:
- Input devices are used for data input
- Output devices are used for data output
- Storage devices are used to store data for long periods of time
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