What is the difference between V-Brake road bike and disc brake road bike?

I'm not really sure if road bikes use V brakes?

But a v-brake uses a pad on the rim to stop and a disc brake is like a dirt bike, brake disc down by the hub.

Martin001 if you don't know the difference between v brakes and disc brakes you shouldn't be riding a bike. Do your self a favor and go to vitalmtb.com it is a bike specific website.