Jiu Jitsu is a type of sport fighting where two people try to take each other down to the ground, and then use different techniques to try and make the other person give up. It's kinda like pretending to fight, but using special moves to try to win. The goal is to use your body and your mind to outsmart and overpower your opponent. It takes a lot of practice and skill to be good at jiu jitsu, but it can be a lot of fun to learn and play.