Corn starch is made from the starch that comes from corn kernels. It is commonly used in recipes to thicken liquids or add a layer of richness in the stews and gravies. In Australia, we tend to use the terms corn starch and corn flour interchangeably. However, I understand in America, corn flour is something completely different. Corn flour is made from the whole kernel, not just the starchy component like corn starch. The coarser grain is known as cornmeal and is used to make grits, cornbread and polenta. Whilst a finer version would be used as cornflour. Corn starch is typically gluten free, whilst corn flour is not.