parafoil

Whats the purpose of a proxy site?...
I can see not wanting to leave a trail when you surf the net but porn sites dont work unless you have cookies enabled so what would a proxy site be used for? ... A site like this seems like it would filter out the things you would be trying to find..... I know a business would use it to regulate what employees are seeing, when they are supposed to be working... I meant It won't let you block your trail when surfing porn........