Question on dvd and video card/dvd decoder card???

[briddle]

I want to buy a dvd player and a vc to go into a 1.2 gig or 1.33 gig tbird/epox DDR mobo system. I saw on the dell website that they offer a geforce video card that will work with cetain dvd players.

Question, what is the dvd decoder card used for and can you get a video card that does it also (Such as the one dell seems to use) ????

Thanks, Bruce