is the umbrella term for all (ko-budō) schools of Japanese swordsmanship, in particular those that predate the Meiji Restoration. Some modern styles of kendo and iaido that were established in the 20th century also included modern forms of kenjutsu in their curriculum. Kenjutsu, which originated with the samurai class of feudal Japan, means "methods, techniques, and the art of the Japanese sword." This is opposed to kendo, which means "the way of the sword" and uses a bamboo sword (shinai) and protective armour (bōgu). The exact activities and conventions undertaken when practicing kenjutsu vary from school to school, where the word school here refers to the practice, methods, ethics, and metaphysics of a given tradition, yet commonly include practice of battlefield techniques without an opponent and techniques whereby two practitioners perform kata (featuring full contact strikes to the body in some styles and no body contact strikes permitted in others). Although kata training has always been the mainstay, in later periods, schools incorporated sparring under a variety of conditions, from using solid wooden bokutō to the use of a bamboo sword (shinai) and armor (bōgu). In modern times sparring in Japanese martial art is more strongly associated with kendo and is mainly practiced by students or the police force. Although kendo is common in Japan, it is also practiced in other countries around the world.