A server is a type of computer that runs faster, carries more load, and is more expensive than an ordinary computer. Servers provide computing or application services to other clients on the network, such as PCS, smart phones, ATM terminals and even large devices such as train systems. The server has high-speed CPU computing capability, reliable running for a long time, strong I/O external data processing capability, and better scalability.According to the service provided by the server, generally speaking, the server has the ability to respond to the service request, undertake the service, and guarantee the service. Server as an electronic equipment, its internal structure is very complex, but with the common computer internal structure is not much different, such as: cpu, hard disk, memory, system, system bus, etc....