The Lilienthal Glider was an early heavier-than-air flying machine designed by German aviation pioneer Otto Lilienthal. First flown in the late 19th century, it featured a simple, lightweight structure made of wood and fabric. Lilienthal's glider was notable for its ability to glide over short distances, demonstrating the principles of controlled flight. Lilienthal conducted numerous flights with various glider designs, contributing significantly to the understanding of aerodynamics. His work laid the groundwork for future aviation developments, influencing later inventors like the Wright brothers. The glider remains an important milestone in the history of flight.