Elevator/Pitch provides stability by producing a downward force on the tail. Aeroplanes are traditionally nose-heavy and this downward force is required to compensate for that. The second is to direct the nose of the aircraft either upwards or downwards, known as pitch, in order to make the aeroplane climb and descend.

Stabiliser is a wing that produces a tail down force (it is actually an inverted wing). The elevator increases or decreases that force. The Elevator, by moving upwards, pulling the control Yoke or Stick backwards, increases the Angle of Attack of the Stabiliser, so it creates a nose up motion because the tail down force increases. By moving the Elevator downward, pushing the control Yoke or Stick forwards it decreases the Angle of Attack of the Stabiliser so it creates a nose down motion because the tail down force decreases.

The effect of pulling the control yoke or stick backwards, the aircraft's tail will produce an increased downward force, causing the aircraft's nose to rise.