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A proxy server is a computer system that acts as an intermediary between a client, such as a web browser, and a server. The proxy server receives requests from the client, forwards the requests to the server, and responds to the server.

A proxy server can be used for a variety of purposes, including filtering web traffic, caching web pages, and providing anonymity for users. A proxy server can also be used to improve performance by caching frequently accessed pages and serving them from the cache instead of from the server.

A proxy server can have a variety of duties, depending on the type of proxy server and the purpose for which it is used. A proxy server used for web filtering may be responsible for blocking access to inappropriate websites.

A proxy server used for caching may be responsible for caching pages that are frequently accessed. A proxy server used for anonymity may be responsible for hiding the identity of the user.