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Computer, commonly known as computer, is a modern electronic computer used for high-speed calculation, which can not only perform numerical calculation, but also logical calculation, and also has the functions of storage and memory. It is a modern intelligent electronic device that can run according to the program and automatically process massive data at high speed. It consists of hardware system and software system, and a computer without any software is called bare metal. It can be divided into five categories: supercomputer, industrial control computer, network computer, personal computer and embedded computer. More advanced computers include biological computers, photonic computers and quantum computers.