Brazilian Jiu-Jitsu or BJJ SummaryBrazilian Jiu-Jitsu (BJJ) is a grappling martial art that uses joint locks, strangulations, strong positioning to cause an opponent to submit / tap-out in competition or pass-out or break a joint in self defense.
It is primarily a ground-fighting art and is well-known for its use in Mixed Martial Arts fights. It was made widely popular by Royce Gracie of the Gracie family who have basically "invented" BJJ.
Royce's father Helio Gracie was taught Japanese Jujutsu / Kobokan Judo and refined it to work for his small stature.
There are many schools and BJJ instructors in USA now. Primarily the art is now competition based - both grappling and MMA competitions. People train it without the gi and with a gi. Many schools are now called Submission Wrestling schools who train no-gi and also use more wrestling takedowns as well.
The training is excellent for physical fitness as well as self-defense. Many argue that all fights go the ground eventually and that is where BJJ shines.