Whats the difference between bumpmap and regular map

Normal mapping is a type of bump mapping that involves a normal map, an image that contains an XYZ direction vector (i.e. normal vector) at each pixel to be used in polygon surface lighting calculations. Some types of bump mapping are done without a normal map. With all types of bump mapping, the goal is to increase surface lighting detail without adding more polygons or vertices.

Bumpmap textures make your texture set look more detailed, almost as if they are popping out. They look 3d. It only works in 3.72 and lower.