The terms "frosting" and "icing" are often used interchangeably, but there are slight differences in their meanings and application when it comes to baking and decorating cakes.
Frosting: Frosting is a thick, creamy, and spreadable mixture that is used to cover the entire surface of a cake. It is usually made with ingredients like butter, powdered sugar, and flavorings (such as vanilla or chocolate). Frosting can be fluffy and smooth, and it's often used to create a smooth and even finish on cakes. It can also be used to pipe decorative designs, borders, or lettering on the cake. Frosting is typically thicker and richer than icing, and it tends to have a slightly heavier texture.
Icing: Icing, on the other hand, is a thinner, glaze-like coating that is often used to drizzle over the top of a cake or to coat cookies. Icing is made with powdered sugar and liquid (such as milk or water) and can have various flavors and colors added to it. It is more fluid and has a glossier appearance compared to frosting. Icing is perfect for adding a thin, sweet layer to the surface of baked goods and can be used to create decorative patterns or writing with a fine tip.
In summary, frosting is thicker and used to cover the entire cake, while icing is thinner and typically used as a glaze or drizzle. Both can be used for decorative purposes, but they have different consistencies and uses in cake decorating. The choice between frosting and icing depends on the desired appearance and taste you want for your baked goods.