Foam cake
Appearance
Foam Cakes are cakes with very little (if any) fatty material such as butter, oil or shortening, and which are leavened primarily by the air that is beaten into the egg whites that they contain. They differ from butter cakes, which contain shortening, and baking powder or baking soda for leavening purposes. Examples of foam cakes are angel food cake, meringue and chiffon cake.