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These are the 2D representation of a 3D model that exists mainly to transpose image textures on to the model.
Blender offers tools for hand-painting textures with digital "brushes".
Blender allows us to tranpose geometric information to image texture format in a process called "baking".
Sometimes you need to use an external application to edit your textures. Here's how you can painless jump out of and back into Blender when texturing.
Test your knowledge to prove you know a thing or two about texturing with Blender.
Its getting old , and there is a better tutorial online on CGCookies
https://cgcookie.com/courses/fundamentals-of-texturing-in-blender?playlist=bjw3r5
This is a very nice course to get into something that I feel is kinda really hard, but also not so hard if you get it right. Try watching it one or two extra times so you really get used to the vocabulary and the interface, what to do where,etc :)