A glass curtain wall is a building facade made primarily of glass panels, supported by a lightweight frame. This design allows for large expanses of glass, providing natural light and unobstructed views. The curtain wall is non-structural, meaning it does not support the building's weight, which is carried by the structural frame. These walls are commonly used in modern architecture, enhancing the aesthetic appeal of buildings like skyscrapers. They also improve energy efficiency by allowing for better insulation and solar control. Notable examples include the Burj Khalifa and the One World Trade Center.