Oatmeal is a type of coarse flour made of hulled oat grains (groats) that have either been milled (ground) or steel-cut. Ground oats are also called "white oats". Steel-cut oats are known as "coarse oatmeal", "Irish oatmeal" or "pinhead oats". Rolled oats can be either thick or thin, and may be categorized as "old-fashioned", "quick", or "instant", depending on the cooking time, which is shortened by the size of the oats, precooking, and sometimes the addition of enzymes.
The term 'oatmeal' is also used in the U.S. and parts of Canada to describe a popular oat porridge made from either ground, steel-cut, or rolled oats.
