Cereal grains are a type of grass that is cultivated for its edible seeds. OATS, ryes, and brans are all examples of cereal grains. OATS are a type of cereal grain that is commonly used to make oatmeal and other breakfast cereals. Rye is a cereal grain that is used to make breads, crackers, and other baked goods. Bran is the outer layer of cereal grains, which is often used as a source of dietary fiber.