Fighting with a katana, the traditional Japanese sword, is often referred to as "Kenjutsu" or "Kendo."

1. Kenjutsu: Kenjutsu is the traditional Japanese martial art of swordsmanship. It encompasses the study and practice of various techniques, strategies, and principles associated with the use of the katana and other Japanese swords. Kenjutsu training involves learning proper sword techniques, footwork, timing, and distancing for effective combat. It often incorporates partner drills, sparring, and the study of kata (pre-arranged sequences of movements) to simulate combat scenarios.
2. Kendo: Kendo is a modern Japanese martial art derived from traditional Kenjutsu. It is often referred to as "The Way of the Sword." Kendo places an emphasis on discipline, sportsmanship, and the cultivation of character. Kendo practitioners wear protective armor (bogu) and engage in sparring using bamboo swords (shinai) to strike valid targets on the opponent's armor. Kendo training focuses on developing proper form, technique, mental focus, and the integration of physical and mental aspects of swordsmanship.

Both Kenjutsu and Kendo involve the study of sword techniques, combat principles, and the cultivation of the warrior spirit. The specific training methods, approaches, and objectives may differ depending on the style, school, or organization.