Jiu is a term that can refer to various concepts, but it is most commonly associated with jiu-jitsu, a martial art focused on grappling and ground fighting. Originating from Japan, jiu-jitsu emphasizes using leverage and technique to control opponents, making it effective for self-defense and competition. In addition to martial arts, "jiu" can also refer to jiu-jitsu styles like Brazilian jiu-jitsu, which evolved in Brazil and incorporates elements of sport and self-defense. This style has gained popularity worldwide, with practitioners training in techniques such as submissions, escapes, and positional control.