Curtain walls are non-structural exterior walls that are typically made of glass and metal. They are designed to protect buildings from weather while allowing natural light to enter. Unlike traditional walls, curtain walls do not support the weight of the building; instead, they are hung from the building's structural frame. These walls are commonly used in modern architecture, providing a sleek and contemporary appearance. They can be found in various types of buildings, including commercial structures and high-rise skyscrapers. Curtain walls also contribute to energy efficiency by incorporating insulation and other materials that help regulate indoor temperatures.