peripheral
  • Any device which transfers data to a CPU and/or receives data from a CPU. Such devices include keyboards, pointing devices, digitizing tablets, scanners, disk drives, microphones, monitors, printers, and speakers. Also, any external device which otherwise assists, enhances, or depends on computer function. Also called peripheral device, peripheral equipment (1), or I/O device.
  • Anything which is auxiliary in nature. For example, an auxiliary device as opposed to a main device.

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