Brazilian jiu-jitsu is a martial art, combat sport and self defence system. It was shaped from early 20th century Kodkan Judo ground fighting. However, it transformed into an art of its own through experimentations, practises and adaptations of Judo.
It is centred around grappling and mainly ground fighting. BJJ allows the smaller, weaker fighter to defend themselves successfully against a bigger and stronger opponent, by using leverage to transfer the fight to the ground and use techniques such as chokeholds.
BJJ is not only a martial art like Judo, but also a device to encourage physical fitness and character in young people, acting as a principle of life.