Cantilever walls are structural elements designed to support loads while extending out from a base without additional support underneath. They are commonly used in retaining wall applications to hold back soil and prevent erosion. The design allows the wall to resist lateral forces, such as soil pressure, by utilizing its weight and the angle of the wall. These walls are typically made from materials like concrete or masonry and can be found in various settings, including landscaping and civil engineering projects. Their effectiveness depends on proper design and construction, ensuring stability and durability in the face of environmental pressures.