The operating system (OS) is essentially a set of programs designed to work with a specific type of computer, such as PC or a Macintosh. Its most important role lies in coordinating the various functions of the computer’s hardware. The operating system also supports the application software you run. An operating system performs five basic functions. In starts the computer, manages applications, manages memory, and handles messages from input and output devices, and provides the user interfaces (a means communicating with the user). The operating system is most often found in hard disk, although on some small handheld computers it is on the memory chip.
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