The katana (刀]] ?) is a type of Japanese sword (日本刀nihontō?), also commonly referred to as a "samurai sword", and generally defined as the standard size moderately curved (as opposed to the older "tachi" style featuring more curvature) Japanese sword with a blade length of greater than 60 cm (23.6 inches).
The katana is characterized by its distinctive appearance: a curved, slender, single edged blade, circular or squared guard, and long grip to accommodate two hands. It has historically been associated with the samurai of feudal Japan, and has become renowned for its sharpness and cutting ability.