A cantilever is a structural element that is anchored at one end and extends horizontally into space without support at the other end. This design allows for overhanging structures, such as balconies or bridges, to be built without the need for additional supports underneath. The cantilever's stability relies on the balance of forces and the materials used in its construction. Common materials for cantilevers include steel, concrete, and wood. The design is often used in architecture and engineering to create open spaces and unique shapes. Famous examples of cantilever structures include the Fallingwater house designed by Frank Lloyd Wright and the Sydney Opera House.