A headlock is a grappling hold used in various combat sports, including wrestling and mixed martial arts. In this position, one person wraps their arm around the opponent's head, typically under the chin, to control their movement. The headlock can be used to immobilize the opponent or set up other techniques. Headlocks can vary in application, such as the standing headlock or the ground headlock. While effective for controlling an opponent, they can also leave the person applying the hold vulnerable to counterattacks if not executed properly. Proper technique and awareness are essential for safety and effectiveness.