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Proxy
A proxy server is a machine used to secure and speed up traffic on a network. The server directs traffic between workstations and Web servers, filters requests made to the Web, or blocks them altogether. The server can be set with specific rules, such as blocking prohibited sites or closing certain ports. Proxy servers can also streamline network performance: For example when a user requests a Web page, the server will cache the page and have it ready if another user requests it.