Flour is derived from cereal grains, root crops, and starchy vegetables. Wheat flour is the most common and is milled from the wheat kernel, which consists of the bran, germ, and endosperm. The endosperm contains starch, ash, fiber, and gluten proteins that are important for different baked goods. Different types of flour are milled and used depending on the baked item, such as whole wheat flour, bread flour high in gluten for breads, all-purpose flour, cake flour for cakes, pastry flour, self-rising flour, enriched flour, and bran flour.