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Proxy server is used to filter requests.
For example, a company might use a proxy server to prevent its employees from accessing a specific set of Web sites.
Proxy server sits between a client application, such as a Web browser, and a real server. It intercepts all requests to the real server to see if it can fulfil the requests itself. If not, it forwards the request to the real server.
Proxy servers have two main purposes:
Improve Performance:
A proxy server improves Internet access speeds from a network primarily by using a caching system. Caching saves recently viewed Web sites, images, and files on a local hard drive so that they don't have to be downloaded from the Web again.
Filter Requests:
Proxy servers can also be used to filter requests. For example, a company might use a proxy server to prevent its employees from accessing a specific set of Web sites.