Amazon Fire TV devices, like Amazon Fire tablets, don’t have access to the standard Google Play Store, so you can’t get at as many audio, video and other apps as you can on, say, an Android TV.

Amazon uses their own app store, but Fire tablets are Android at their core, and can just as easily work with the Play Store.

However, you won't find the Play Store app in the Amazon Appstore. Instead, you'll need to download and install some APK files directly onto your Fire tablet.