Jujutsu, also known as jiu-jitsu and ju-jitsu, is a family of Japanese martial arts and a system of close combat that can be used in a defensive or offensive manner to kill or subdue one or more weaponless or armed and armored opponents. A subset of techniques from certain styles of jujutsu was used to develop many modern martial arts and combat sports, such as judo, aikido, sambo, ARB, Brazilian jiu-jitsu, and mixed martial arts.