Cake is obtained from a chemically leavened batter that results in a spongy and airy texture. There are thousands of cake recipes and variations, but there are some consistencies in defining cake. Cakes are typically circle in shape, however many cakes are also rectangular, or cut into specific shapes in order to be decorated. Cake is almost always sweet, which differentiates cake products from bread, which is typically not sweet. Additionally, cake is often made from a batter, which is much more liquid than dough. Cakes are often named based on their primary ingredients, such as butter cakes, or their shapes, such as Bundt cakes and layer cakes.