Can anybody please tell me the Blue Coat use?

I Want to Know the Blue Coat proxy server?

May I know the Symantec ProxySG?

May I Know the  BlueCoat security gateway?

May I Know, how does reverse proxy work? Can you please explain this to me ?

Can you please explain the exact reverse proxy with an example?

I Want to Know the Exact ProxyPass, can anybody please explain me

May I Know the Different types of proxies?

Actually I don't know how to set up a reverse proxy, so can you please explain how can I Set up a reverse Proxy?

May I know the difference between ProxyPass and ProxyPassReverse?