Media streamers do exactly what they say on the tin. They allow you to stream media, usually TV or video, straight from the web onto your laptop or smart TV.
Whilst you may find that these days most TVs come with some kind of media streaming capability, there are many reasons why you may want to enhance your experience with one of these devices.
Very often smart TV offerings are not exactly what you want to see, or, if your TV is a little older, you may not have the latest services or even any services at all.
Media streaming devices mean that you can fill the holes in these capabilities and tailor your viewing experience to exactly what you want to see.