What did the wright brothers add to their airplane to make it into an airplane?

The Wright brothers added several key features to their aircraft to transform it into a true airplane, including a controllable wing warping mechanism for lateral control, a movable tail for pitch control, and a lightweight engine that provided necessary thrust. Their innovations in aerodynamics and control systems allowed for sustained, powered flight, culminating in their first successful flight on December 17, 1903. These advancements distinguished their design from earlier flying machines by enabling stable and controlled flight.