Brazilian Jiu-jitsu (BJJ) is a self-defense art and competitive sport based on taking your opponent to the ground, achieving positional control by continuous grappling, and applying submission holds involving joint locks and chokeholds until one of the contestants surrenders. It combines aspects of wrestling and Judo as well as its own specific techniques.
Jiu-jitsu basically means "Gentle Art". It was practiced in Japan for a long period of time and it is often believed that the Gracie family from Brazil—through the help of Mitsuyo Maeda from Japan—practiced and developed the Kodokam Judo to modern Brazilian Jiu-jitsu.
Brazilian Jiu-jitsu is based around techniques that teach how to immobilize an opponent by several procedures, including: Pull guard, joint locks, chokeholds, and also the art of defeating an opponent by having more physical strength irrespective of the body composition.