Cereals, also known as grains or cereals, are a group of cultivated plants harvested for their edible seeds or grains. The most common and economically important cereals are rice, maize, wheat, durum wheat, rye, oats, and barley. Cereals are cultivated worldwide on a large scale and provide a source of energy for humans and livestock. In many developing countries, cereals are often the sole source of carbohydrates. Some other important cereals mentioned in the document are sorghum, millet, and buckwheat.