Client is connected The server To use files, printers, and other resources shared by the server. Client is a form of network software operation, which usually adopts a client/server (C/S) structure system, with one or more servers and a large number of clients. Server configuration a large capacity memory And install database system , used for data storage and data retrieval; The client installs special software to be responsible for data input, calculation and output. Client And server are independent computers. When a computer connected to the network provides various network services (such as data and file sharing) to other computers, it is called a server. Those computers used to access server data are called clients.
Strictly speaking, the client/server model is not defined from the perspective of physical distribution, but reflects a network data Access implementation mode. At present, the system with this structure is widely used: such as hotel, hotel room registration, settlement system, supermarket POS System, bank, post and telecommunications network system, etc. 
