The rudder is a part of the vertical stabilizer on an aircraft. When desired, it can move to the left, or the right. The rudder sticking out into the wind creates drag, which causes the aircraft to move along the Yaw axis (left to right).
It part of the tail.
rudder
You keep the rudder straight.
You keep the rudder centralised.
The rudder
rudder
the rudder, elevators, and ailerons steer a airplane.
The rudder of the plane stabilizes an aeroplane.
The rudder steers the aircraft in a flat turn. You can turn by using ailerons only, but with rudder to help, it's much more efficient.
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Depending on context this could either be 'aft' (when inside the airplane), or 'Empennage' when referring to the entire tail section (the horizontal and vertical stabilizers, the rudder, the elevators, as well as rudder and elevator trim).
It counteracts adverse yaw caused by the ailerons when banking for a turn. The rudder pedals also steer the plane on the ground.