An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer program. The operating system is a component of the system software in a computer system. Application program usually require an operating system to function.
Time sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources.
For hardware functions such as input and output and memory allocating, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer—from cellular phones and video games console to web server and supercomputers
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