Katame-Waza refers to a category of techniques in Judo that focuses on grappling and controlling an opponent on the ground. These techniques include holds, pins, and submissions, allowing a practitioner to immobilize or submit their opponent effectively. The primary goal of Katame-Waza is to gain dominance over an opponent by using leverage and body positioning. It is essential for judokas to master these techniques, as they can be decisive in competitions and self-defense situations, showcasing the importance of ground control in martial arts.