proxy server is a server thing that acts as an intermediary for requests from clients looking for resources from other servers. A clients connects to the proxy server, requesting some service, such as a file, web page, resource available from a dissimilar server and the proxy server evaluates the request as a way to simplify and control its complexity.Meanwhile, most proxies are web proxies, granting access to web content on the world and most of tem masking our anonymity. A caching proxy server accelerates service requests by retrieving content saved from a previous http request made by the same people. Caching proxies keep local copies of frequently requested files, allowing huge companys to significantly reduce their traffic bandwidth usage, while significantly increasing performance. Any can mask your IP address, also can give secure things, like to mask you from some tracking ads networks with bothering ads. Another thing, with you can bypass some youtube, facebook, video and many other social network limitations, unlock content for your country, bypassing it.