Yeah, cable tv cables are different from telephone/dsl lines and antennas. The ones most people have here are coaxial cables that uses radio frequency to send signals. Cable is better than dsl because it can pack more data per cross section of the line than dsl cables can. Usually they're only found in cities because it costs the cable company a lot of money to install and maintain the lines. Whereas telephone lines already exist for many households so no extra money for laying down lines are needed.

There is an even fancier cable option in my city, optical fiber cables. Fiber internet is faster than coaxial cable internet because the data density is even better. Imagine downloading a 4gb high-def movie in 2 minutes and a half, that's now fast it is. Unfortunately the infrastructure still new so it costs over $200/months for fiber and not everyone can get this service. Most people use the normal cable option that is ~10 times slower and costs ~$50/month.