An exterior wall is the outermost vertical structure of a building that provides support and protection from the elements. It serves as a barrier against weather conditions such as rain, wind, and temperature changes, helping to maintain a comfortable indoor environment. Exterior walls can be made from various materials, including brick, wood, concrete, and vinyl. In addition to structural support, exterior walls often play a role in the building's aesthetic appeal. They can be finished with different textures and colors, contributing to the overall design. Proper insulation within exterior walls is also essential for energy efficiency, helping to reduce heating and cooling costs.