Oatmeal is made of hulled oat grains – groats – that have either been ground, steel-cut, or rolled. Ground oats are also called “white oats”. Steel-cut oats are known as “coarse oatmeal” or “Irish oatmeal” or “pinhead oats”. Rolled oats can be either thick or thin, and may be “old-fashioned” or “quick” or “instant”. The term “oatmeal” is also used in the U.S., Australia, and parts of Canada as another word for an oat porridge made from either the ground, steel-cut, or rolled oats.