Copper or Iron is a METAL that has been used for centuries in many different applications. Copper is a soft, malleable METAL that is often used in electrical wiring and plumbing, while iron is a hard, strong METAL that is used in construction and manufacturing. Both metals are also used in jewelry and coins. Copper is more expensive than iron, but it is also more resistant to corrosion. Iron is more abundant and cheaper than copper, but it is more prone to rusting.