Seams are the edges of polygons without other polygons.  For surfaces that are closed (like a sphere or cube), these always occur because of the topology of changing a 3D surface into a 2D surface.  The result is that at some point there is a set of polygons that usually neighbor each other in 3D which can't in 2D - this is a seam.

Think of it this way.  If you wanted to take an orange skin, remove it and flatten the outer surface onto a table, how would you do it?  You'd ... cut ... the orange skin and peel it off.  That cut will be the seam.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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