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Brazilian Jiu-Jitsu is a martial art and combat sport system that focuses on grappling and especially ground fighting. Brazilian Jiu-Jitsu was formed from Kodokan judo ground fighting (newaza) fundamentals. Brazilian Jiu-Jitsu eventually came to be its own combat sport through the experiments, practices, and adaptation of judo.

BJJ promotes the concept that a smaller, weaker person can successfully defend themselves or another against a bigger, stronger, heavier assailant by using proper technique, leverage, and most notably, taking the fight to the ground, and then applying joint locks and chokeholds to defeat the opponent. BJJ training can be used for sport grappling tournaments and in self-defense situations. Sparring (commonly referred to as "rolling" within the BJJ community) and live drilling play a major role in training, and a premium is placed on performance, especially in competition, in relation to progress and ascension through its ranking system.

Since its inception in 1882, its parent art of judo was separated from older systems of Japanese jujutsu by an important difference that was passed on to Brazilian Jiu-Jujitsu. It is not solely a martial art; it is also a sport, a method for promoting physical fitness and building character in young people, and ultimately a way of life.