Sorghum bicolor, commonly called sorghum (/ˈsɔrɡəm/) and also known as durra, jowari, or milo, is a grass species cultivated for its grain, which is used for food, both for animals and humans, and for ethanol production. Sorghum originated in northern Africa, and is now cultivated widely in tropical and subtropical regions. Sorghum is the world's fifth most important cereal crop after rice, wheat, maize and barley. S. bicolor is typically an annual, but some cultivars are perennial.