Hello.

Well, I've been reading up a bit on it, yet I still don't understand it. As you can read on Wikipedia, bump mapping is:
a computer graphics technique where at each pixel, a perturbation to the surface normal of the object being rendered is looked up in a heightmap and applied before the illumination calculation is done (see, for instance, Phong shading). The result is a richer, more detailed surface representation that more closely resembles the details inherent in the natural world. Normal mapping is the most commonly used bump mapping technique, but there are other alternatives, such as parallax mapping.
Okay, then what do I need for a SIMPLE bump mapping effect? I already have my texture and a normal map. How do I apply bump mapping? Simply by putting these two textures on an object? Or do I have to do some extra calculations, like mentioned in the quotation?

Please explain it to me.

Thank you in advance.