An operating system is an integrated set of programs that controls the resources such as CPU, memory, I/O devices etc., of a computer systemand provides its users with an interface or virtual machine that is more convenient to use that the bare machine.
An operating system is master control program that runs the computer and acts as a scheduler. It controls the flow of signals from CPU to various parts of the computer. It is first program loaded into the memory when the computer is tured on. Popular operating systems are MS-DOS, Windows and UNIX.
An operating system (also called as OS) supervises and provides services to computer users. It permits the computer to supervise its own operations by automatically calling in the applications programs and managing the data needed to produce the output desired by users. It isolates the hardware from the user. The functions provided by OS are transparent or invisible to the users.
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