The UFC is the Ultimate Fighting Championship which is a USA company that’s been heavily promoting Mixed Martial Arts the last few years.  As a result, Muay Thai and Kickboxing and other arts that are used a lot in the fights are now a lot better known. There’s a post at that’s a good short intro to MAA.  As well, we have a short write-up on the Boxing Martial Arts that are used a lot in MAA on this site – Boxing Martial Arts.