This document discusses icing and frosting, their functions, types, and ingredients. Icing refers to a sweet glaze used to decorate baked goods, while frosting is used to enhance flavor and appearance. Both are primarily used to cover and decorate cakes, and can be formed into shapes. There are many types of icings including buttercream, fondant, ganache, and royal icing, as well as cooked and uncooked varieties. Ingredients commonly used include sugar, butter, milk, cream cheese, and flavorings.