There are two types of steaming gadgets: set-top boxes and HDMI sticks. Streaming boxes are larger and more expensive, but tend to be more powerful.
(Bonus:Need more help choosing the best video streaming option? We have other helpful charts that will help you make an informed decision. Click here to see a chart comparing streaming sticks, and here for a comparison of streaming service channel line-ups.)
Here is a chart comparing popular streaming boxes.