Fondant is a type of icing used in cake decorating. It is a thick, creamy paste made from sugar, water, and gelatin or glycerin. Fondant is often used to cover cakes and cupcakes, as well as to create decorations such as flowers, figures, and other shapes. It can also be used to make edible decorations for cakes and cupcakes. Fondant is a popular choice for wedding cakes and other special occasion cakes due to its smooth, glossy finish.