Under the hood, it turns out that your Kindle is running a custom version of Android, the same operating system that powers Samsung Galaxy S6 smartphones and LG wearables, televisions and much more. Congrats on what sounds like a very nice present: the Amazon Kindle Fire HD and Fire 8 are very nice tablets with vivid color screens and, of course, tight integration with the Amazon experience, both books through Kindle and shopping through the various Amazon apps you can download.