Bump maps are used in imaging software, usually 3D rendering software, to simulate texture on a surface. This might be the slight indentations of grain textures on wood or the deep scarring of a war-torn concrete wall. Bump maps are probably the easiest way to add an extra dimension of photorealism and should be part of any 3D artists standard texturing workflow.
Bump maps save time in simulating texture effects on 3D models
UV Mapping channels can help map separate textures to a single object in such a way that allows different UV tiling configurations. This is useful in cases where blending masks are used, different resolution textures are used, or when repeating patterns need to be broken up for a more natural look. In this tutorial, you'll see how to quickly leverage UV Mapping to add a grungy water splashing effect to the bottom of a wall...