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Technically they don't. They're just much much more useful with one. The operating system provides a means to run other programs and do basic housekeeping chores on the computer.

A computer can be built to run without an operating system, instead executing a particular program at startup which then takes over control of the computer and handles everything internally. In fact, an operating system itself is just such a program, though one that can temporarily transfer (partial or complete) control over to other programs.

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12y ago

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