Metal materials are solid substances that are typically hard, shiny, and good conductors of heat and electricity. They are often used in construction, manufacturing, and various industries due to their strength and durability. Common examples of metals include iron, aluminum, and copper, each with unique properties that make them suitable for different applications. Metals can be categorized into two main groups: ferrous and non-ferrous. Ferrous metals, like steel and cast iron, contain iron and are known for their strength but can rust. Non-ferrous metals, such as zinc and lead, do not contain iron and are generally more resistant to corrosion, making them ideal for specific uses.