Some people call it bump mapping, but it's technical name is parallax occlusion mapping. And when most people hear bump mapping, they think of normal mapping.
Normal mapping looks like this:
[img]http://www.ozone3d.net/tutorials/images/bump_mapping/torus_bump_mapping_01_w580.jpg[/img]
Whereas bump mapping/parallax occlusion mapping looks like this: [img]http://www.reallyslick.com/pictures/offsetmapping.jpg[/img]
According to the source engine and every other engine I've seen it in, normal mapping can also be called bump mapping, and parallax occlusion is called just that.
No, switch those pictures.
Bump mapping just tells the computer where the bright spits are. Normal mapping is placing a high poly model in it.
Parallax Occlusion does not put a high poly model in, it just moves the view on the texture at different rates to simulate depth. That and normal mapping are used to produce an effect that looks 3d without breaking the poly budget.