Karate mainly focuses on unarmed techniques, using body parts such as fists, feet, elbows, and knees for attack and defense, including kicking, hitting, throwing, holding, throwing, locking, twisting, reverse techniques, acupoints, and other techniques. However, some schools also practice weapon techniques. The term 'empty handed' means' empty hand ', which not only refers to the use of tools but also implies the philosophical connotation of' emptiness' in Buddhism. As a form of martial arts, karate not only emphasizes the cultivation of combat skills, but also emphasizes etiquette, self-discipline, and spiritual cultivation. Among various rules, the World Karate Federation (WKF) adopts a first in, then out rule, emphasizing the speed and skill of technical application.