Answer:
The "tail", or vertical stabilizer, allows for increased aerodynamic stability about the vertical axis of the aircraft. The vertical stabilizer typically houses the rudder which is responsible for yawing the aircraft, controlled via the rudder pedals inside the cockpit. The chief job of the rudder is to correct for adverse yaw, a condition which exists when an aircraft rolls into a turn and the nose actually yaws opposite to the direction of the turn. This is because the aileron(s) on the wing opposite to the direction of the turn is deflected upward creating drag and spoiling lift, causing the wing to not only drop but to be pushed backwards.