Cast iron is a group of iron-carbon alloys with a carbon content greater than 2%. It is characterized by its relatively low melting point, excellent fluidity when molten, and good castability properties, making it ideal for casting complex shapes and structures. Cast iron typically contains other elements such as silicon, manganese, sulfur, and phosphorus, which influence its properties and performance. It is widely used in various applications, including cookware, pipes, machinery components, and architectural elements, due to its durability, heat retention, and cost-effectiveness.