Aikido is a Japanese martial art developed in the early 20th century by Morihei Ueshiba. It is a form of self-defense that emphasizes the use of circular movements and joint locks to redirect an opponent's attack and control their balance.
From Wikipedia
Aikido is a modern Japanese martial art which is split into many different styles including Aikikai, Shodokan Aikido, Yoshinkan, Renshinkai, Iwama Ryu, Iwama Shin Shin Aiki Shuren Kai, and Ki Aikido. Aikido is now practiced in around 140 countries.