Yes, cast iron is a type of iron. It is an alloy of iron that contains a higher carbon content compared to other forms of iron, which gives it its distinctive properties. Cast iron typically contains about 2 to 4 percent carbon, along with varying amounts of silicon, manganese, sulfur, and phosphorus. This composition gives cast iron its characteristic strength, heat retention, and excellent heat distribution properties, making it a popular choice for cookware. The carbon content in cast iron also contributes to its grayish appearance.