Japanese jiu-jitsu is a traditional martial art that originated in Japan. It focuses on using an opponent's energy and movements against them, emphasizing techniques such as joint locks, throws, and grappling. Practitioners learn to defend themselves without relying on brute strength, making it accessible to people of all sizes. The art was developed by the samurai as a method of unarmed combat, especially when they were disarmed. Over time, it has influenced various modern martial arts, including Brazilian jiu-jitsu and judo, which have adapted its principles for sport and self-defense.