Bump maps are somewhat more complex than one of the two previous examples. Bump maps are a kind of texture map that can allow a more realistic representation of bumps or depressions on the surface of a model.
A wall as an example: the image of a wall could be mapped to a flat polygon plane and described as completed, but it doesn`t look very convincing in a final rendering. For a flat surface does not reactas well to light as a wall to light as a wall with cracks and its coarseness.
To reinforce the impression of realism, one would add a bump or normal map to recreate the coarse, grainy surface of bricks more closely and reinforce the illusion that the cracks between the bricks are actually receding in space.
Of course, it would be possible to achieve the same effect by modeling each individual brick by hand, but a normal mapped plane is much more computationally efficient. The importance of normal maps in the game industry is high, because games without normal maps would never look like they do in reality today.
Bump, Displacement and Normal map deserve a discussion and are indispensable for creating photorealistic renderings.
Other important map types.
In addition to the already introduced map types, there are some more that you will encounter quite often.
The Reflection Map tells the software which parts of the 3D model to reflect. If the entire surface of a model is reflective or the plane of reflection is uniform, the use of the Reflection Map is unnecessary. Reflection Maps are grayscale images, where black is 0% reflective and white is 100% reflective.