Strength is an attribute in Defense of the Ancients. It is a stat that primarily focuses on a hero's health and health regeneration. Strength Heroes are generally tanks or off-tanks (heroes that can deal a lot of damage while being able to take a lot). Strength can also be built on carries and mages to compensate for their early game squishiness.
Strength gives 19 health and 0.03 hp regen per second for every point.