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Elevators, which are on the tail of a plane, help an airplane go up and down, which we call pitch.

When the pilot wants the plane to go up, they tilt the elevator up. This means there is LESS lift on the tail than on the wings, so the nose of the plane goes up! Vice versa, when they want to lower the nose of the plane and pitch down, the elevator goes down, creating more lift on the tail of the plane.