Fences can play the roles of protection, demarcation of areas, decoration, and so on. For example, in the pasture, the fence made of iron wire can prevent the domestic animals from running out; in the park, the beautiful fence can demarcate different activity areas. Fences can be made of materials such as wood, metals (such as iron, aluminum), plastic, and even stones. The wooden fence gives people a natural and warm feeling; the metal fence is usually more sturdy and durable.