You can pay for a service from Netflix, Amazon, or through your Itunes account if you have AppleTV. Im sure there are others. For a fee you can watch their content, tv shows and movies, right over your internet connection. The streaming is that it comes over your internet connection rather than you having to use physical media, like a dvd or something.
Lol. I feel stupid. Had that for years, didn't know the term...
Homeland is incredible. I kept asking, "how is this going to continue?"... Pulls you in.