Jiu-Jitsu, often referred to as Brazilian Jiu-Jitsu (BJJ), is a martial art and combat sport that focuses on grappling and ground fighting. Its roots can be traced back to Japanese Judo and traditional Japanese Jiu-Jitsu, but it was further developed and popularized in Brazil. The core principle of Jiu-Jitsu is to enable a smaller or weaker individual to defend against and, using proper techniques, overcome a larger and stronger opponent. 

This is achieved primarily through the use of leverage, body positioning, and submission holds such as joint locks and chokeholds. Jiu-Jitsu emphasizes taking an opponent to the ground and employing ground fighting techniques and submission holds involving joint-locks and chokeholds. The strategy is to control and overpower the opponent, leading them to a submission.

Brazilian Jiu-Jitsu training can be used for sport grappling tournaments (gi and no-gi) and mixed martial arts (MMA) competition. It is known for its effectiveness in real combat situations, which has made it a cornerstone of MMA. Beyond its combat effectiveness, Jiu-Jitsu is also regarded as a way to promote physical fitness and build character in young people, fostering principles such as respect, discipline, and perseverance.