Bioprocessing is the use of biological means, such as the action of enzymes or other microorganisms, to treat various materials using a set of defined procedures. When this process is used to treat starch-based biomass, it is referred to as starch bioprocessing. Starch is a complex carbohydrate, found in cereal crops like wheat and corn. Because starch-containing biomass forms the basis of many lubricants, fuel additives, and other biochemicals commonly sold on the market, starch bioprocessing is often used in product manufacturing, in the conversion of waste materials to useful by-products, and in the breakdown of waste materials.