High-lift devices are aerodynamic features on aircraft that enhance lift during takeoff and landing. These devices include flaps, slats, and leading-edge devices, which increase the wing's surface area and change its shape. By doing so, they allow the aircraft to fly at slower speeds without stalling, making it safer and more efficient during critical phases of flight. In addition to improving lift, high-lift devices help reduce the required runway length for takeoff and landing. This is particularly beneficial for aircraft operating in environments with shorter runways or in adverse weather conditions. Overall, high-lift devices play a crucial role in the design and performance of modern aircraft.