Forward Proxy vs Reverse Proxy

Forward Proxy: Proxy server serving the communication from internal client machines to internet.

Reverse Proxy: Proxy server serving the communication from the Internet to the internal content servers.

Reverse proxy:
http://www.ibm.com/developerworks/websphere/library/techarticles/0512_guminy/0512_guminy.html

Forward Proxy (from client machines to internet) vs Reverse Proxy (from internet to the client machines):
http://www.serverwatch.com/sreviews/article.php/1151471

Proxy Servers at Wikipedia
http://en.wikipedia.org/wiki/Proxy_server

Reverse Proxy at Wikipedia
http://en.wikipedia.org/wiki/Reverse_proxy