A heel is the bottom, back part of a shoe or boot that provides elevation. The styling and construction of a heel may vary (i.e., stacked, stilletto, spiked, sculptured, kitten).
About Loafers:
Loafers are low, step-in shoes with tops that resemble moccasins, and have broad flat heels. Loafers have no shoelaces or buckles which act as fasteners and are Slip On Shoes.