A sailplane, also known as a glider, is a type of aircraft designed for unpowered flight. It relies on rising air currents, called thermals, to gain altitude and extend its flight duration. Sailplanes are typically lightweight and have long wings, which help them glide efficiently through the air. Pilots of sailplanes often use techniques like soaring to stay aloft for long periods. These aircraft are popular in recreational flying and competitive events, where pilots aim to cover the greatest distance or stay airborne the longest. Sailplanes can be towed into the air by powered aircraft or launched from a hill.