jiu jitsu is a japanese martial art taught by koma maeda to the gracie family of brazil, the gracie's then developed it into a modified hybrid style, encomposing numerous street fighting and grappling techniques which made it more practical for street fighting use, hence the name gracie jiu jitsu or brazilian jiu jitsu, in was made popular by the UFC (if your familiar with i) its is considered the premeir grappling style there is in existence w/ mentions to sambo and judo, it is still the basis from which most MMA (mixed martial arts) fighters take their ground game.