Brazilian jiu-jitsu also abbreviated as BJJ, is a self-defence martial art and combat sport based on grappling, ground fighting, and submission holds. BJJ is primarily a ground-based fighting style and focuses on taking one's opponent down to the ground, gaining a dominant position, and using a number of techniques to force them into submission via joint locks, chokeholds, or compression locks.
 

It was first developed around 1925 by Brazilian brothers Carlos, Oswaldo, Gastão Jr., and Hélio Gracie, after Carlos was taught a hybrid fighting style of traditional Jujutsu and Kodokan judo by a travelling Japanese judoka, Mitsuyo Maeda, in 1917. Later on the Gracie family developed their own self-defense system which they named Gracie Jiu-Jitsu. BJJ eventually came to be its own defined combat sport through the innovations, practices, and adaptation of Gracie jiu-jitsu and judo, and has become one of the essential martial arts for modern MMA.