Buying entertainment apps from the Amazon App Store can cost a lot of money, but there are so many free streaming apps from various other developers that cann't be used with this device. Due to the blocking installed by manufacturers, you cann't install them. So, jailbreak Firestick is the unlocking process of this Amazon gadget that allows you to use free movie and entertainment apps that aren't available in the Amazon store. In this article https://www.firesticktricks.com/jailbreak-fire-stick.html you can find explaintion how to unlock your Fire TV Stick. I find this really one of the most useful guides out there.