Mostly known as an RPG game for the playstation console. Though it does have a few games on other systems.(Such as Game Cube, and Game boy.)
It has breath taking graphics and beautiful character designs, but can lack a good storyline.(I think they're relying to much on eye candy lately...)
There are also two movies and two series of Final Fantasy.
The movies are FF: The Spirits Within and FF7: Advent Children.
The series are Final Fantasy Unlmited and Final Fantasy Crystal Legend.(Or so I believe that's it. Sorry, I'm not quite sure. ^^;;)