I’ve been getting asked this a bit lately by a some people who read here. Basically it’s a small streaming device that you can plug into your TV so you can watch channels and shows via the web without a computer. It’s like Apple TV but Linux based instead. They can be small like a thumb drive or big like a hockey puck. They’re even making Roku Smart TV’s now. O_o
You can also watch movies on it as well as play small games. My version comes with a free version of Angry Birds, so I’m cursed now…