Exterior walls are the outermost walls of a building, providing structural support and protection from the elements. They are typically made from materials like wood, brick, concrete, or metal, and are designed to withstand weather conditions such as rain, wind, and temperature changes. These walls also play a crucial role in insulation, helping to maintain a comfortable indoor environment. Additionally, exterior walls can enhance the aesthetic appeal of a building, often featuring windows, doors, and decorative elements that contribute to the overall design.