Ju Jitsu was developed during the feudal ages of Japan as a method for defeating an armed and armoured opponent in which one uses no weapon or only a short weapon.
Because striking against an armoured opponent proved ineffective, practitioners learned that the most efficient methods for neutralizing an enemy took the form of pins, joint locks, and throws.
These techniques were developed around the principle of using an attacker’s energy against him, rather than directly opposing it.
There are many variations of art, which leads to a diversity of approaches. In addition to Ju Jitsu, many schools teach the use of weapons (Kobudo).
Today, Ju Jitsu is practised in both traditional and modern sport forms.
Derived sport forms include the Olympic sport and martial art of judo, which was developed by Kanō Jigorō in the late 19th century from several traditional styles of Ju Jitsu, and Brazilian jiu-jitsu, which was derived from earlier (pre–World War II) versions of Kodokan judo.