SmashWiki:Article of the Week/2007-19

A hitbox is the area of an attack that is able to damage your opponent. This area is invisible and is not always part of what is used to attack. The developers use the term collision bubbles to describe hitboxes as well as the area of an object or character that the hitbox interacts with. Collision bubbles can only be viewed in Debug Mode. The status of each kind of collision bubble is represented by its color. (read further...)