A full tang refers to the construction of a sword where the blade extends all the way through the handle, resulting in a solid, continuous piece of metal that runs the entire length of the sword. In other words, the tang is the portion of the blade that extends into the handle.

A full tang is considered to be a desirable feature in a sword for several reasons:

1. Strength and Durability: A full tang construction provides increased strength and durability to the sword. By having the blade extend through the handle, the sword becomes less prone to breaking or snapping at the junction between the blade and the handle.
2. Balance and Control: A full tang contributes to the overall balance and control of the sword. The distribution of weight along the entire length of the sword allows for better maneuverability and handling, improving the wielder's control over the weapon.
3. Resistance to Lateral Forces: A full tang construction enhances the sword's ability to withstand lateral forces and impacts. It helps to distribute and absorb the force evenly along the entire length of the sword, reducing the risk of structural failure.
4. Potential for Additional Strength and Customization: A full tang allows for the possibility of adding handle scales or grip materials directly to the tang, providing a secure and comfortable grip. It also offers opportunities for customization, such as adding decorative elements or pommels.

Having a full tang is especially important for functional swords intended for combat, training, or heavy use, as it ensures the sword's structural integrity and longevity. It provides confidence in the sword's strength and ability to withstand the demands of rigorous activities.

When considering purchasing a sword, it is recommended to verify if it has a full tang construction, particularly if you are seeking a sword for practical or martial arts purposes. A full tang contributes to the overall quality and reliability of the sword.