An airfoil is a shape designed to generate lift when air flows over it. Commonly used in aircraft wings, the airfoil's curved upper surface and flatter lower surface create a difference in air pressure, allowing the aircraft to rise. The angle of attack, or the angle between the airfoil and the oncoming air, also influences lift. Airfoils are essential in various applications beyond aviation, including wind turbine blades and propeller designs. Their efficiency in manipulating airflow makes them crucial for optimizing performance in many engineering fields. Understanding airfoil design helps improve the functionality of these devices.