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. When baking a cake, most cooks aim to create a light, fluffy cake with a tender crumb. This requires a flour with a low protein content, as protein promotes the production of gluten, which can make baked goods more tough. It also means that the flour must be very finely milled, to keep baked goods from getting heavy. Finally, a flour which is starchy and able to hold large amounts of fat and sugar without collapsing is required.All of these needs are addressed with cake flour, which is made from the endosperm of soft wheat. The endosperm is the softest part of the wheat kernel, making cake flour the finest flour available. As cake flour is milled, it is heavily bleached, not only to make it white but to break down the protein in the flour. The fine grain absorbs fat readily, ensuring that butter and other fats in cakes are well distributed throughout the batter. Cake flour can also carry a high volume of sugar when compared to higher protein flours. Since cake flour is a high-starch flour, it is extremely well suited for certain baking tasks.