Platform describes footwear with raised, thick soles of at least one and a half inches in height. Platform soles are often made of cork, plastic, rubber or wood and are generally worn for fashion or to add height.
About Wedge:
Wedge shoes, also referred to as wedge heels or wedges, are shoes with a triangular shape heel in the form of a wedge, with the heel and sole forming a solid block. Wedge heel shoes generally raise the heel of wearer between 1" to 3" and considered to be more stable that other types of high heel shoes. Wedge shoes come in a variety of styles, including sandals, pumps, and boots.