In the last lesson we learned how a wing creates lift: camber, thickness, angle of attack, pressure differences, and the turning of airflow all work together. But lift does not grow without limit. Push the angle of attack far enough, and something dramatic happens—the smooth airflow that was generating all that lift falls apart. That event is the stall, and understanding it is essential because most aviation accidents in small aircraft happen near a stall. This lesson explains what the stall really is, why it happens, how designers manage it, and how aircraft use movable surfaces called high-lift devices to fly safely and slowly for takeoff and landing.