An armbar is a common submission technique used in martial arts, particularly in Brazilian Jiu-Jitsu and MMA. It involves isolating an opponent's arm and applying pressure to the elbow joint, forcing them to submit or risk injury. The technique can be executed from various positions, including the guard or mount. To perform an armbar, the practitioner typically secures the opponent's arm between their legs while controlling the shoulder. By extending the hips and pulling the arm down, the practitioner creates leverage that can lead to a successful submission. Proper technique and timing are essential for effectiveness and safety.