What is the function of the ailerons on an airplane?

The ailerons are crucial components located on the outer sections of an airplane's wings. Their primary function is to control the roll of the aircraft. When a pilot moves the control yoke or stick left or right, one aileron moves upward while the other moves downward. This movement causes differential lift across the wings, resulting in the airplane rolling to the left or right. This rolling motion is essential for turning and maneuvering the aircraft in flight. Thus, their role in controlling roll is fundamental for maintaining and changing the aircraft's direction during flight.