Brazilian Jiu Jitsu ( BJJ ) is a martial art and sport which focuses on maintaining the distance between the opponent and continue the fight on the floor. In principle It is based on for a weak and small person to able to defend himself  from an opponent who is more powerful than himself by keeping  opponent under control with power of pressure and the right techniques.  After putting opponent on the ground, he is being defeated usualy applying techniques to the weaker parts of the body ( joints, throat)

Brazilian Jiu Jitsu (BJJ), as meaning it refers ' Delicate art '. This is because strength and / or aggressiveness of a competitor is being used against him by using  the principle of leverage in the scietnce of physics effectively.