Ferrous metals refer to any metal that contains iron. They are favoured for their tensile strength and durability, so are often utilised in housing construction, large-scale piping and industrial containers. While ferrous metals contain some degree of iron (its name derived from the Latin term meaning iron), non-ferrous metal does not contain iron as a component. Both non-ferrous and ferrous metals have been used by humans since ancient times. The term ferrous metal refers to any metal containing iron. As a result of their iron content, ferrous metals are magnetic, strong, and hard.