A computer peripheral is any external device that provides input and output for the computer. For example, a keyboard and mouse are input peripherals, while a monitor and printer are output peripherals. Computer peripherals, or peripheral devices, are sometimes called "I/O devices" because they provide input and output for the computer. Some peripherals, such as external hard drives, provide both input and output for the computer.
For an extended list of various peripheral devices, view this Help Center article.
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This page contains a technical definiton of Peripheral. It explains in computing terminology what Peripheral means and is one of many hardware terms in the TechTerms dictionary.
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