Cereal grasses are a type of grass that is grown for its edible grains. Rye, millet, OATS, and maize are all examples of cereal grasses. Rye is a grass that is grown for its edible grain and is used to make bread, beer, and whiskey. Millet is a small-seeded grass that is used to make porridge and other dishes. OATS are a cereal grain that is used to make oatmeal and other breakfast cereals. Maize is a cereal grain that is used to make cornmeal, tortillas, and other foods.