Chili flakes, also known as crushed red pepper, are made from dried and crushed chili peppers. They are commonly used as a spice to add heat and flavor to various dishes, including pizzas, pastas, and soups. The heat level can vary depending on the type of chili used, with some being mild and others quite spicy. These flakes are often found in the spice aisle of grocery stores and can be sprinkled directly onto food or incorporated into recipes. They are a popular ingredient in many cuisines, including Italian, Mexican, and Indian cooking, enhancing the overall taste of meals.