I don't understand the concept of wrapping?

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http://en.wikipedia.org/wiki/UV_mapping

do you know how the eath is a sphere. if you were seeing the earth from a front view this is what you would see
earth.jpg


now you wonder if you made the earth a 3d model how would you paint if we could only see the front?

well you project it in a 2d plane like this
worldProjection.jpg
 
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