A server is a type of computer. It runs faster, has a higher load, and is more expensive than an ordinary computer. The server provides computing or application services for other clients (such as PCs, smart phones, ATMs and other terminals or even large equipment such as train systems) in the network. The server has high-speed CPU computing power, long-term reliable operation, powerful I/O external data throughput and better scalability. According to the services provided by the server, in general, the server has the ability to respond to service requests, undertake services, and guarantee services. As an electronic device, a server has a very complicated internal structure, but it is not much different from the internal structure of an ordinary computer, such as: cpu, hard disk, memory, system, system bus, etc.