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 Platform Sandals:
Platform sandals are sandals with a thick, raised outsole where both the heel and the toes are raised, thus providing height to the wearer. Platform sandals may also have an elevated toe area with a separate heel.