What is Cake Flour?

Cake flour is a highly specialized type of wheat flour, intended for use in making cakes, cookies, and other delicate baked goods. Several characteristics differentiate cake flour from other wheat flours, making it unsuitable for certain tasks like baking bread. Many markets carry cake flour, and in a pinch a substitute can be made with ¾ cup sifted bleached all purpose flour and two tablespoons of cornstarch.