hardbodies

i know this might sound stupid…but what are they…ive heard tlk about it the whole time and ive looked for something on blender…but cant find anything!!

could someone please tellme what they are used for?
THanks

Hard bodies are used in the game engine of blender to automaticaly apply gravity and bounce objects off each other.

http://www.blender.org/cms/Bullet_Physics.724.0.html

tutorial
https://blenderartists.org/forum/viewtopic.php?t=55822&highlight=rigidbody