Regarding historical background, it was developed after tachi ( another Japanese sword) and is considered more than just a weapon. Among samurai people, it reflects the character, rich in discipline, honor, and moral qualities, and marked a high social status. In the Kamakura era (1185-1333), it was designed and used for cutting and stabbing to some extent. But soon after the Kamakura period ended, the Edo period started, and it began to be used as the finest cutting weapon of the military. In the early Edo period, it was considered a symbol of appreciation. But in the late Edo period, it became the code of warriors. With time, traditionally made katanas were considered as national treasures. Although they are now built as modern katanas used for martial arts.