A cast iron skillet is a versatile cooking tool made from cast iron, known for its excellent heat retention and even cooking. It can be used on the stovetop, in the oven, or even over an open flame, making it ideal for various cooking methods, including frying, baking, and sautéing. These skillets are often pre-seasoned with oil, creating a natural non-stick surface that improves with use. With proper care, a cast iron skillet can last for generations, making it a popular choice for both home cooks and professional chefs alike.