An operating system (OS) is a kind of computer program that helps a computer to interact with other machines or with people. An OS is not actually one single program but a group of small programs, like file managers, device drivers, and kernels. An OS can be small (like Damn Small Linux), or large (like Microsoft Windows). Some are meant for everyday use, like in a personal computer or a smartphone. Others are very specialized - for example, an ATM uses a kind of operating system.
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