The ailerons on an aircraft are used to control the roll of the aircraft. When the pilot moves the control column or yoke to the left or right, the ailerons on the wings move in opposite directions. For example, if the pilot moves the control to the left, the right aileron goes up while the left aileron goes down. This differential movement creates a difference in lift between the wings, causing the aircraft to roll to the left. By using ailerons, the pilot can control the aircraft's bank angle and make turns.
In summary, ailerons are used to control the roll of an aircraft by changing the lift on the wings.
