No fold, straight labels are usually sewn or ironed onto the garment.
End fold: Folded down on left and right hand side and stitched on at either end.
Mitre fold: The ends are folded under and up creating a tab to be sewn into the seam of a garment.
Loop fold: Folded in the middle and usually sewn into the seam, also used for hem or sleeve labels.
Manhattan fold: Like a centre fold but the top is also folded down creating a flap to tuck the bottom into.