"Ferrous" refers to metals that contain iron, which gives them magnetic properties and makes them prone to rust when exposed to moisture. Common examples of ferrous metals include steel and cast iron. These materials are widely used in construction and manufacturing due to their strength and durability. On the other hand, "non-ferrous" metals do not contain iron and are generally more resistant to corrosion. Examples include aluminum, copper, and zinc. Non-ferrous metals are often used in applications where weight, conductivity, or resistance to rust is important, such as in electrical wiring and aerospace components.