Definition: A computer is a collection of electrical and mechanical devices that can accept input via input devices and can provide output via output devices.
Hardware Definition:
Hardware is the physical aspect of computer and other devices hardware is a collective term. Hardware includes not only the computer proper but also the cables, connectors, power supply units, and peripheral devices such as the keyboard, mouse, audio speakers, and printers. Hardware is sometimes used as a term collectively describing the physical aspects of telephony and telecommunications network infrastructure
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