A proxy server is a server (a computer system or an application program) which services the requests of its clients by forwarding requests to other servers. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource, available from a different server. The proxy server provides the resource by connecting to the specified server and requesting the service on behalf of the client. A proxy server may optionally alter the client's request or the server's response, and sometimes it may serve the request without contacting the specified server.
It is possible to hide your real IP address on the Web by using an anonymous proxy server. A proxy acts as an intermediary, routing network packets between your computer and the Internet. When using a proxy for anonymous web surfing, an IP address of that proxy is relayed instead of your own helping you stay anonymous
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