Jiu-Jitsu is also translated "Gentle Art." It helps a smaller, weaker individual to immobilize an opponent a control as little effort as possible. 

Unlike other martial arts focused on striking, Jiu-Jitsu allows students to practice real-world speed and strength with much less chance of injury. Jiu Jitsu's methods are about wrestling with "submissions" such as chokes or joint locks. If a student is positioned in a weak spot, they merely "tap-out" and the match ends.