Membrane structures are architectural forms that utilize flexible materials, such as fabric or plastic, to create lightweight and efficient enclosures. These structures are often tensioned to maintain their shape and can be used for various applications, including sports arenas, exhibition halls, and temporary shelters. Their design allows for large spans without the need for extensive support systems. The key advantage of membrane structures is their ability to adapt to different environments while providing natural light and ventilation. They are often more sustainable than traditional buildings, as they require less material and can be easily disassembled or relocated. Examples include the Millennium Dome in London and the Allianz Arena in Munich.