The bread part of a cake is commonly referred to as the "cake layer" or simply the "cake." It is the main component of a cake that gives it its structure, texture, and flavor. The cake layer is typically made from a combination of flour, sugar, eggs, butter or oil, leavening agents (such as baking powder or baking soda), and other flavorings or additives, depending on the specific recipe. It forms the base on which other elements like frosting, fillings, and decorations are added to create a complete cake.