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 In an enterprise that uses the Internet, a proxy server is a server that acts as an intermediary between a workstation user and the internet  so that the enterprise can ensure security, administrative control, and caching service. A proxy server is associated with or part of gateway server that separates the enterprise network from the outside network and  a firewall server that protects the enterprise network from outside intrusion.

A proxy server receives a request for an internet service from a user. If it passes filtering requirements, the proxy server, assuming it also a cache server, looks  in its local cache of  previously downloaded web pages. I f it finds the page, it returns it to the user without needing to forward the request to the internet. If the page is not in the cache,proxy server act as a client on behalf of user, uses one of its own IP addresses to request the page from server out on the internet. When the page is returned, the proxy server relates it to the original request and forward it on to the user. To the user, the Proxy server is invisible; all Internet requests and returned responses appear  to be directly with the addressed Internet server.
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