The primary ingredient in flour is wheat. Wheat is a cereal grain that is milled to produce flour, which is a staple in many diets worldwide. Different types of wheat are used to make various kinds of flour, such as all-purpose, whole wheat, and bread flour, each having distinct properties and uses in baking and cooking. The starches and proteins present in wheat contribute to the flour’s ability to form dough and create structure in baked goods. Other grains, such as rye, corn, and rice, can also be milled into flour, but wheat flour remains the most commonly used.