Flour is made from wheat and other grains. It contains protein, starch, moisture and other components. The protein content determines the type of flour and its uses. All-purpose flour is good for many baked goods due to its moderate protein level. Cake and pastry flours have less protein and produce more tender results. Bread flour has higher protein for elastic dough. The protein allows gluten to form, giving structure during baking. Bakers select flours based on the intended texture of their final product.