So the Roku may sound like this really technical concept, but it's actually a really simple device. If you are wondering how all of this works, just read on.
Chances are, if you are reading this, you have access to the internet at home. What the Roku does is it connects to it's channels over your existing internet connection and displays the content on your TV.
So, for example, if you have a Netflix account. The Roku would connect to your account and just show your movies or TV shows from Netflix on your TV. But don't think you are only limited to content from Netflx. Roku has a number of channels that it shows, including Amazon videos, Hulu Plus, NBA TV, NHL TV, You Tube and much more.
All of this content it gets over the internet instead of using Satelite or Cable.
Of course, the best way to get a sense of how a television device works is to check it out in a video.
Here is a video overview of the roku player: