Operating systems can be divided into three levels according to their functions

#The operating system is divided into three levels: system layer, management layer and application layer according to their functional relationships.

The operating system is a computer program that manages computer hardware and software resources. It is also the core and cornerstone of the computer system. The operating system needs to handle basic tasks such as managing and configuring memory, determining the priority of system resource supply and demand, controlling input and output devices, operating the network, and managing the file system.

Computer operating systems are divided into different types according to different uses. From a functional perspective, they include real-time systems, batch processing systems, time-sharing systems, network operating systems, etc.

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