Control surfaces are essential components of an aircraft that help manage its movement in the air. These surfaces include the ailerons, elevator, and rudder, which work together to control the plane's roll, pitch, and yaw. By adjusting these surfaces, pilots can steer the aircraft and maintain stability during flight. When a pilot moves the control yoke or stick, it changes the position of the control surfaces. For example, moving the yoke left raises the ailerons on one wing, causing the aircraft to roll in that direction. This interaction between the pilot's inputs and the control surfaces is crucial for safe and effective flying.