Feed corn, also known as field corn or cow corn, is a type of maize (Zea mays) grown primarily for livestock fodder, ethanol, cereal, and processed food products. It is different from sweet corn, which is the variety of corn that is consumed largely by humans. The principal field corn varieties are dent corn, flint corn, flour corn, and waxy corn. Field corn is allowed to mature fully before being shelled off the cob and being stored in silos, pits, bins, or grain "flats". It can also be harvested as high-moisture corn, shelled off the cob and piled and packed like silage for fermentation. Large-scale applications for field corn include livestock fodder, cereal products, and other processed human-food products such as corn starch, corn oil, corn syrup, and high-fructose corn syrup. Field corn is processed for its various uses in what are known as "wet mills".