WoW CD to playFollow

Well, is this a dumb question? I don't have WoW yet, and I was wondering if you need the CD to play. People who have the beta client don't need a CD, so do you need a CD to play the game where you buy the package? Probably yes, but I'm trying to make sure. Do you just install it and play?

So you don't need a CD to play WoW? Thanks.