Royal icing is a type of icing made from sugar, water, and meringue powder. It is used to decorate cakes, cookies, and other desserts. Meringue powder is a dried egg white that is used to make meringues and other desserts. It is made by whipping egg whites until they are stiff and then drying them in a dehydrator or oven. Royal icing made with meringue powder is stiffer and has a longer shelf life than royal icing made with fresh egg whites.
Royal icing is a versatile icing that can be used to create a variety of different looks. It can be piped into intricate designs, or it can be spread onto cakes and cookies to create a smooth, glossy finish. Royal icing can also be tinted with food coloring to create a variety of different colors.