Riprap is a type of erosion control made from large stones or concrete pieces placed along shorelines, riverbanks, or slopes. Its primary purpose is to protect these areas from the damaging effects of water flow and wave action. By absorbing and deflecting the energy of moving water, riprap helps prevent soil erosion and maintains the stability of the land. Riprap can also enhance the habitat for aquatic life by providing shelter and breeding grounds. It is commonly used in civil engineering projects, such as the construction of dams and retaining walls, to ensure the longevity and safety of these structures.