Metal surfaces refer to the outer layers of metal objects, which can vary in texture, finish, and appearance. These surfaces can be smooth, rough, shiny, or dull, depending on how the metal has been processed. Common metals include steel, aluminum, and copper, each having unique properties that affect their surface characteristics. The treatment of metal surfaces is important for various applications, including corrosion resistance and aesthetic appeal. Techniques such as polishing, painting, and coating can enhance the durability and look of metal surfaces, making them suitable for use in industries like construction, automotive, and electronics.