MD5 Hash Algorithm

I really don't understand the MD5 Hash Algorithm. I have Ankit Fadia's Network Security: A Hacker's Perspective (which, I know, is just plaigerised material from the Net) and it describes it, but I just don't understand...any of it. Please help me out here, perhaps a tutorial or something.

Thanks,
<seiferaistlinlp>

http://www.rsasecurity.com/rsalabs/node.asp?id=2253

PS: Next time just google.