Many are kids that go to school this will be helpful to them. I have seen tons of tutorials on using a cracker and using a proxy etc. But you need to realize that some schools block that too.
Ok, let's start from the beginning. We all know that Google is more than a search engine; we do use it as provider for email, mapping, news and many other services. Google is now also a free proxy service. Proxy is a device that stands between a PC and the internet, providing all the connections to the world wide web. What a proxy does is to receive all data from a requested site, so when you access web pages all data come from proxy.
The purpose of this is simple. To access blocked site.