Frosting sheets are also known as edible paper or icing sheets. They are the substrate that you print on with edible inks for cake decorating purposes. Frosting sheets are backed with plastic so that they slide through your printer in much the same way that normal paper does, and they get printed on with edible ink. Then the plastic backing is removed, and the frosting sheet aka icing sheet is applied to a layer of frosting on top of the cake. See below for instructions on how to print to your frosting sheets and apply them to your cake.