server

A server or a server (British:) Server) is a system sponsoring some kind of service for the demand from a user (a client) in the field of the computer. It was a term of the software, but I turned, and the comparatively large-sized computer (the whole system which included hardware or the software) for business use came to be originally called a server.

The server is originally a term in the client server model that is one of the distributed computing technology used by a computer network. The server accepts the demand (a request) from a client, and it is the software of the side to offer some kind of service (processing) to. If the service to offer is different by the kind of the server, and is the offer of the file (data) which keeps if, for example, is file server, print server;, as for the offers of the print processing to the printer, is various.

I turned, and the computer (hardware) which comparatively attached great importance to reliability with large size for business use came to be called "a server" because there were many cases used for an above-mentioned server use. A UNIX deployment server and the PC server of the dispersion system (called the open system in Japan) were called "server computer" (a server machine, a server airplane) mainly at first, but open normal correspondence for servers advanced to the mainframes in 1990's, and cases to call the large-scale computer whole "a server" increased.

By the intensive processing represented by a mainframe until 1960's and an office computer, the most of computer processing was performed in a central "host computer" side, and only minimum screen control (an input check, drawing) was in charge of "a terminal" (a terminal) in the side.

Take many of processing with "a client" as one form of the distributed processing with a work station and a performance enhancement / the price reduction of the personal computer in 1990's from 1970's;, as for "the server, the client server models that processed the demand from a client spread". There was the tide of the downsizing, too and a lot of servers according to the purpose were built in each company and spread. It was an advantage that the client server model had many cases that role allotment could build by low-priced hardware and software by clarification, but a lot of servers and the operative management (reliability, TCO, security) of the client became a problem.

The intensive handling of new form spread, and the importance of the server was realized again in 2000's by rise of the Internet. Furthermore, by the cloud computing, a lot of servers gathered by the data center carry out most of processing.