1. Construction: Metals like steel, aluminum, and iron are used extensively in buildings, bridges, roads, and other infrastructure. They provide strength, durability, and resistance to weather and wear.

2. Transportation: Metals are essential for vehicles. Steel is used in car bodies, trains, and ships. Aluminum is lightweight and corrosion-resistant, making it ideal for aircraft and bicycles.

3. Electronics: Metals like copper and gold are crucial components in electrical circuits and electronic devices. Copper is an excellent conductor of electricity, while gold is highly resistant to corrosion.

4. Medical Devices: Certain metals, like titanium and stainless steel, are biocompatible and used in implants, surgical instruments, and medical devices. These metals are resistant to corrosion and can withstand the harsh conditions within the body.