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. A basic icing is called a glacé, containing powdered sugar (also known as icing sugar or confectioners' sugar) and water. This can be flavored and colored as desired, for example, by using lemon juice in place of the water.