The purpose of this site is to provide free proxy services as well as the information about using proxies for various purposes.
The main benefit of using a proxy is the fact that it separates the client from the destination server therefore avoiding a direct communications between them. Due to a proxy server being in this middle position, it can be configured to perform a variety of functions based on the requests it receives.
Using Proxy to Unblock Websites - if your internet service provider is blocking some website, then using a proxy will "unblock it". It will work because you won't be making a direct connection to the website but instead instructing some proxy server to fetch the website for you and forward it back you. As far as your internet provider is conserned, you have never even visited that site - only the connection between you and the proxy server is visible.
Using Proxy to Bypass Country Restrictions - some websites are restricting their services to a particular list of countries. One good example is YouTube that blocks certain videos to visitors outside the United States. This restriction can be bypassed by using a proxy located in one of the countries that are allowed to use it. In the case of YouTube, a person living in the United Kingdom can use a proxy located in the United States in order to appear as if you are from United States thus bypassing such restriction.