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An operating system is a collection of programs that control and manage computer software and hardware resources and organize multiple users to share multiple resources in a reasonable and effective way. The role of the operating system: 1, the management of various resources in the system;2, to provide users with a good interface.

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An operating system (OS) is a computer program that manages computer hardware and software resources. An operating system is a collection of programs that control and manage computer software and hardware resources and organize multiple users to share multiple resources in a reasonable and effective way.

Operating systems handle basic tasks such as managing and configuring memory, prioritizing supply and demand for system resources, controlling input and output devices, operating networks, and managing file systems. The operating system also provides an interface for users to interact with the system.

The role of the operating system:

(1)(2) Provide a good interface for users.

The operating system has four basic characteristics:

(1)Concurrency: Concurrency is when two or more events or activities occur within the same time interval.

(2)Sharing: Sharing is another important feature of the operating system, which means that resources in the operating system (including hardware resources and software resources) can be used by multiple concurrent processes rather than being exclusive to one process.

(3)Virtuality: A management technique in an operating system that maps a physical entity into several logical counterparts.

(4)Uncertainty: In multi-channel programming, there are direct or indirect relationships between programs, and the speed of a program is affected by its operating environment. At this time, multiple runs of the same program and data may result in different results; the running time and running sequence of the program are also uncertain; the time of external input requests and running failures is also difficult to predict. These are expressions of uncertainty.

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