There are two main types of metal fences: wrought iron and aluminum. Wrought iron fences are known for their durability and ornate design, making them a popular choice for decorative purposes. They can also include additional features like spikes at the top for enhanced security. On the other hand, aluminum fences are lightweight yet sturdy, providing both security and a decorative touch. They are well-suited for a range of applications, from residential yards to commercial properties, due to their resistance to rust and ability to withstand various environmental conditions.