What is the function of the elevator on an aircraft?

The function of the elevator on an aircraft is to control the pitch. Pitch refers to the angle of the aircraft's nose relative to the horizontal plane. When the elevator is deflected upwards, it pushes the tail down, causing the nose to rise and the aircraft to climb. Conversely, when the elevator is deflected downwards, it pushes the tail up, pulling the nose down and causing the aircraft to descend. This control allows pilots to manage altitude and maneuver the aircraft during flight, making it a critical component in maintaining the desired flight path and stability. The other choices refer to different aspects of aircraft movement: roll is controlled by ailerons, yaw is controlled by the rudder, and while speed and altitude can be influenced by various controls including the elevator, they are not directly regulated by it.