Corn is the third most important crop in the world after wheat and rice.It is grown in the summer as it needs a hot atmosphere to grow properly and it contains a lot of seeds covered with yellow yarns which protects it from the sun's burning. It can be used as a whole food after peeling and boiling. It can also be converted into flour after being picked, dried, then grinded, and extracting starch from it. It has several types, including yellow maize, white corn and two-color maize, which contain some white and other yellow grains and there is also corn that its grain is used making popcorn .