Pig iron is a type of crude iron that is produced from iron ore in a blast furnace. It contains a high percentage of carbon, typically around 3-4%, along with other impurities like silicon and manganese. This makes it brittle and not suitable for direct use in most applications. To make steel or other iron products, pig iron is usually further refined. This process involves removing excess carbon and impurities, resulting in a more malleable and stronger material. Pig iron serves as a key intermediate in the production of various iron and steel products.