Boundary Layer Control refers to techniques used to manage the flow of air or fluid near the surface of an object, such as an aircraft wing or a ship hull. This control is crucial because the boundary layer, a thin layer of fluid close to the surface, can significantly affect drag and lift. By manipulating this layer, engineers aim to improve performance and efficiency. Methods of Boundary Layer Control include suction, blowing, and the use of vortex generators. These techniques help delay flow separation, reduce drag, and enhance overall aerodynamic or hydrodynamic performance, leading to better fuel efficiency and stability in various applications.