What is the main characteristic of a unit classified as a Tank?

A unit classified as a Tank is primarily characterized by its ability to absorb damage on behalf of other units. This means that in combat scenarios, the Tank will typically engage the enemy first and take the brunt of the attacks, protecting more vulnerable units, such as damage dealers or support characters, located behind it.

The Tank's role revolves around holding the frontline and drawing aggro (enemy attention), thus allowing other units to function effectively and execute their roles without being immediately threatened. This characteristic is vital in team composition in games because it enables a strategic approach to both offense and defense.

While some Tanks may possess secondary abilities, such as dealing acceptable damage or providing limited healing or buffs, their essential function is to be a formidable presence in combat, effectively soaking up damage so that other units can thrive in the battle.