Katanas are Japanese swords. They are an iconic symbol of Japanese culture and are closely associated with the samurai warrior class of feudal Japan. The katana is characterized by its curved, single-edged blade, circular or squared guard (tsuba), and long grip that accommodates two hands.

The development of the katana can be traced back to the Heian period (794-1185) in Japan, with further refinements and popularity during the Kamakura period (1185-1333) and subsequent eras. The katana's design and craftsmanship reflect the unique traditions and historical context of Japan.

It's important to note that while there have been historical and cultural exchanges between China and Japan, the katana is a distinct Japanese sword. Chinese swords, such as the jian and dao, have their own characteristics and cultural significance. Each sword represents the unique traditions, craftsmanship, and martial heritage of its respective culture.