Pastry decoration is a type of culinary art that involves the use of icing to decorate cakes, cupcakes, and other desserts. Icing is a type of sweet, creamy topping made from sugar, butter, and milk or cream, and is often used to give desserts a more decorative look. It can be used to create intricate designs, such as flowers, stars, and swirls, and can also be used to write words or phrases on cakes.