Icing, or frosting, is a sweet, often creamy glaze made of sugar with a liquid, such as water or milk, that is often enriched with ingredients like butter, egg whites, cream cheese, or flavorings. It is used to coat or decorate baked goods, such as cakes. When it is used between layers of cake it is known as a filling.

Cake decorating is the art of decorating a cake for special occasions such as birthdays, weddings, baby showers, national or religious holidays, or as a promotional item.