Proxy Servers
The idea of a proxy is authorising someone to take your place or to do something for you. An example could be that you ask a friend to return your library books for you because they are going to the library.
A proxy server is one that acts on behalf of another server, usually for Web related purposes. The proxy server is set up by an organisation's system administrator as a gateway between trusted (local server) and non-trusted networks (Internet).
A proxy server allows internal users to get web pages from web servers without having to communicate with them directly. Only the firewall-protected proxy server is allowed to connect to the Internet. This process is invisible to users and is used to maintain network security.
Click on this link to read more about proxy servers: http://en.wikipedia.org/wiki/Proxy_server
Next: Content Filtering
