Crushed red pepper or chili flakes is a condiment or spice consisting of dried & crushed (as opposed to ground) red chili peppers.
Crushed red pepper shakers have become a standard on tables at Mediterranean restaurants—and especially pizza parlours—around the world.Often there is a high ratio of seeds, which are popularly believed to contain the most spice. Crushed red pepper is used by food manufacturers in pickling blends, chowders, spaghetti sauce, pizza sauce, soups and sausage.