Grain is any grass-like plant that we can eat. The most common grains across the world are wheat, followed by rice and corn (maize). Other important grains are barley, oats, rye, millet and sorghum.
Grain is the seeds from the seedhead. Seedheads of wheat and barley are called 'ears'. Seedheads of corn may be called cobs, ears or kernals.
Many of these cereal plants were developed over 7,000 years ago in the area of the Middle East called Mesopotamia, an area around the famous historic city of Babylon.
Grains contain a range of vitamins, but they are one of the most important sources of carbohydrate, and this gives us long-term energy. Eating carbohydrates tends to make us feel full. That is one reason people suggest a bowl of cereal for breakfast.