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ANSWERS: 3
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Are you sure you don't mean 'serging'? that's the part of the bolt that is different from the material. Usually thinner or of a different texture. The mill does that so the material won't unravel.
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Perhaps you mean the selvage edges? If so, these are the tightly woven edges that run along the lengthwise grain. See a simple illustration at http://www.sewaquilt.com/fabric-grain.html
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Selvage definition: In a woven fabric, the selvage (or selvedge) is the uncut edge of the fabric which is on the right- and left-hand edges as it comes out of the loom. As such it is 'finished' and will not fray because the weft threads double back on themselves. The term also refers to the unfinished but structurally sound edges of flat knitted textiles
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