[brewdad]

Sling is a subscription service, like Netflix, but instead of a library of movies and shows, you subscribe to Live TV streams of channels normally only available from a cable TV subscription. It's all fully legal and above board, as they pay the same licensing fees that a Comcast would.

As the other poster mentioned, like Netflix, you need an internet connection. If you want to watch it on your TV screen, a set-top box like a Roku or AppleTV is worthwhile but you could always plug your laptop into the TV instead.