Corn starch is a pure starch powder that is extracted from corn kernels by removing all of their outer bran and germ leaving behind the starch-rich endosperm. This white powdery substance is widely used in cooking and baking and also as a thickening agent. All your favourite dishes like Manchurians, chicken pakoras among others use corn starch powder to make tasty and thick gravies. It is mainly used as a binding agent in cooking.