Newbie needs help! Drowning inown ignorance!

Allright, so i just got reccomended to this site, and i want to get an iso for a game, but i have no friggin' idea how. I don't know what the hell an ftp is, or how to get it to work. If someone could be patient enough to explain this to me, then there will be one less stupid person in the world.
Aw, thanks so much man. It always warms my heart to know there are still good people on the net. if only the rest of the world was so kind...