Red pepper flakes are small, dried pieces of chili peppers, often made from varieties like cayenne or Serrano. They are commonly used as a spice to add heat and flavor to various dishes, including pizzas, pastas, and soups. The flakes can vary in heat level, depending on the type of pepper used and the amount of seeds included. These flakes are typically sold in small containers and can be found in most grocery stores. They are a popular ingredient in many cuisines around the world, especially in Italian and Mexican cooking, where they enhance the overall taste of meals.