A wedding cake is a traditional cake served at weddings. It is usually multi-layered and decorated with frosting, flowers, and other decorations. The term 'wedding cake layers' refers to the TIERS of the cake, which are the individual layers stacked on top of each other. Each tier can be a different flavor or color, and they are often separated by pillars or dowels for stability. The number of TIERS can vary, but five TIERS is a common number.