Koryu refers to traditional Japanese martial arts that have been practiced for centuries, often dating back to the feudal era. These schools of martial arts emphasize techniques and philosophies that have been passed down through generations, focusing on various disciplines such as swordsmanship, archery, and unarmed combat. The term "Koryu" translates to "old school" and is used to distinguish these traditional practices from modern martial arts, known as Gendai. Koryu schools often have a rich history and unique training methods, preserving the cultural heritage and combat techniques of Japan's past.