Operating system is a software layer close to hardware, and its function is to directly control and manage system resources (including software and hardware). Under the management and control of the operating system, the hardware of the computer system can give full play to its functions. From the user's point of view, after the introduction of the operating system, the computer system has become a machine with stronger hardware system functions, higher service quality and more convenient use. Operating system, together with other system software, provides a good working environment for users, and users can use computers conveniently without knowing many details of hardware and system software.

The operating system runs on the hardware system that resides in memory and provides two interfaces for the upper layer: the operating interface and the programming interface. The operation interface consists of a series of operation commands, through which users can use the computer conveniently. The programming interface consists of a series of system calls, which can be used by various programs to make the operating system serve them and use hardware and software resources through the operating system. So other programs run on the basis of the functions provided by the operating system.

Baidu Encyclopedia: Operating System

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