Corn, called maize outside the United States, is one of the most familiar types of grains. Grain is the harvested seed of grasses such as wheat, oats, rice, sorghum, millet, rye, and barley.

Photograph by Glenn Upton, MyShot

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Grain is the harvested seed of grasses such as wheat, oats, rice, and corn. Other important grains include sorghum, millet, rye, and barley.