You’ll get the most out of the Fire HD 10 if you subscribe to Amazon Prime, which gets you access to Amazon’s libraries of movies, TV shows, music and more, in addition to the free two-day shipping for Amazon purchases.
All of that content is presented front and center on the Prime HD 10, which is basically a Trojan horse to get you using these services. In fact, I think that’s why it’s so affordable — my guess is Amazon is basically giving these away at or close to cost, so that people consume and buy its digital content. (That’s true for the Kindle, anyway.)
Aside from Amazon’s Prime content, you can also download Android apps, including popular ones such as Spotify, Hulu and Netflix, in case you want to watch other content.