Adding Animations - Creating E-Learning Games with Unity - page 199

A third use of hierarchies was for animation. Since rotations, translations, and scales
that are applied to a parent transform are propagated to all of the children, we have a
way of developing fine-tuned motion for a hierarchy of objects. It turns out that char-
acters in games and animated objects alike use this hierarchy of transforms tech-
nique to implement their motion.