The oat (Avena sativa) is a species of cereal grain, and the seeds of this plant. They are used for food for people and as fodder for animals, especially poultry and horses. Oat straw is used as animal bedding and sometimes as animal feed.
Since oats are unsuitable for making bread on their own, due to their lack of gluten, they are often served as a porridge made from crushed or rolled oats (see oatmeal), and are also baked into cookies (oatcakes), which can have added wheat flour. As oat flour or oatmeal, they are also used in a variety of other baked goods (e.g. bread made from a mixture of oatmeal and wheat flour) and cold cereals, and as an ingredient in muesli and granola. Oats may also be consumed raw, and cookies with raw oats are becoming popular. Oats are also occasionally used in Britain for brewing beer. Oatmeal stout is one variety brewed using a percentage of oats for the wort. The more rarely used Oat Malt is produced by the Thomas Fawcett & Sons Maltings and was used in the Maclay Oat Malt Stout before Maclay ceased independent brewing operations.
Oats also have non-food uses. Oat straw is also used in corn dolly making, and it is the favourite filling for home made lace pillows. Oat extract can be used to soothe the skin conditions, e.g. in baths, skin products, etc.
A now obsolete Middle English name for the plant was haver (still used in most other Germanic languages), surviving in the name of the livestock feeding bag haversack. In contrast with the names of the other grains, "oat" is usually used in the plural.