Polenta is a dish you make, not a type of ground corn. To make polenta, the main ingredient is cornmeal. Cornmeal is made by grinding dried corn kernels and is sold in three textures: fine, medium, and coarse. Traditionally, polenta is made from coarse ground cornmeal, and this is what a bag labeled as u0022polentau0022 should be. However, sometimes bags of cornmeal that are labeled as u0022polentau0022 are really medium-ground cornmeal. That's okay, too.