Cornmeal is a kind of flour or meal that is made from ground sweet corn. It comes in yellow, white, blue or red varieties, depending on the type of corn used.Since cornmeal is gluten-free, fine and medium cornmeal is usually mixed with wheat flour to create a crumbly texture in baked goods like cornbread or corn muffins. Coarsely ground cornmeal is frequently labeled polenta or grits after the two dishes in which it is the main ingredient.