Kodi is a free media player software that supports a huge range of devices. It is most commonly used on an Amazon Firestick to give people access to free movies, tv shows, and live sports.
In terms of hardware requirements, you simply need to purchase an Amazon Fire TV stick.
Alternatively, you can install it on Android and iOS devices too by downloading the app from their app stores.
You can learn more about how to get Kodi on the Amazon Fire TV Stick from our How to add Kodi to an Amazon Fire TV Stick page.