A nodachi is a type of traditional Japanese sword characterized by its long blade. It typically has a length of over 90 centimeters (35 inches) and is significantly longer than a standard katana. The nodachi is sometimes referred to as an odachi, though the terms are sometimes used interchangeably.

Historically, the nodachi was primarily used as a weapon of war by samurai during feudal Japan. Its longer length provided reach and leverage advantage over opponents, allowing for powerful strikes and sweeping attacks. The nodachi was often employed on the battlefield by skilled warriors who specialized in its use.

The main purpose of the nodachi was to engage and defeat opponents on the battlefield. Its extended reach made it effective against infantry formations, enabling the user to strike multiple opponents with a single swing. The long blade allowed for wide, sweeping cuts that could incapacitate or dismember adversaries.

Additionally, the nodachi could be used for defensive maneuvers, blocking incoming attacks, and creating space between the wielder and their opponents. The sheer size and weight of the nodachi made it intimidating and could serve as a psychological advantage.

Due to its size and weight, the nodachi required considerable strength and skill to wield effectively. Samurai who specialized in wielding the nodachi often underwent extensive training to master its techniques and harness its power. The nodachi was not a weapon commonly used by the average samurai due to its demanding nature.

It's important to note that the nodachi's use on the battlefield declined over time, and its popularity waned as the focus shifted to more versatile and practical weapons. Today, nodachi swords are primarily considered historical artifacts, admired for their craftsmanship and as symbols of Japan's martial heritage. They are often displayed in museums or collected by enthusiasts.