A katana is traditionally held with two hands. When wielding a katana, one hand is positioned closer to the tsuba (guard), while the other hand holds the hilt farther down. This grip with both hands provides stability, control, and balance during various cutting and striking techniques.

The lead hand, which is closer to the tsuba, typically acts as the guiding hand and helps control the direction and angle of the blade. The trailing hand, farther down the hilt, supports and stabilizes the sword, providing additional power and control during strikes.

By using a two-handed grip, the wielder can effectively leverage the weight and length of the katana, enabling precise movements, better control, and increased cutting power. The two-handed grip also allows for swift transitions between different techniques and provides better defense against an opponent's attacks.

While the two-handed grip is the traditional method of wielding a katana, it's worth noting that there can be variations and adaptations in grip depending on the specific martial arts style, personal preference, or specific techniques being employed. Some techniques or situations may require briefly transitioning to a one-handed grip for versatility or speed.

In summary, a katana is generally held with a two-handed grip, with one hand closer to the guard and the other hand farther down the hilt. This grip provides stability, control, and power during various cutting techniques, although there can be variations based on martial arts styles or specific techniques.