Katana was originally a samurai weapon, which was worn thrust through a belt-like sash (obi) with the sharpened edge facing up. Samurai could draw the sword and cut the enemy in a single motion, the quicker reaction in combat the better, which increased the popularity of the Katana among samurai in Japan.
Thanks to Japanese movies and anime like Demon Slayer, Akame ga Kill, Naruto, Blue Exorcist, Gintama, Samurai Champloo, Rurouni Kenshin, Bleach, Samurai Deeper Kyo, etc. The Japanese Katana sword has become increasingly famous with the re-acknowledgement of its value as a work of art.