In computer networks, a proxy server is a computer system that acts as an channel for requests from customers searching resources from other servers. A customers connects to the proxy server, requesting some service, such as a file, web page, resource available from a different server and the proxy server checks the request as a way to simplify and control its complexity.Meanwhile, most proxy servers are web proxies, granting access to web content on the World Wide Web and most of tem affording your personality. A caching proxy server accelerates service requests by retrieving content saved from a previous http request made by the same person. Caching proxies keep local copies of frequently requested files, allowing big organizations to reduce their upstream bandwidth usage and costs, while extremely boosting performance. Some can mask your identity, also can give secure things, for example: to escape you from some watching ads networks with annoying ads. I will tell you, with you can bypass some youtube, facebook, video and many other social network limitations, unlock youtube content for your country, bypassing it.