"A glider or sailplane is a type of glider aircraft used in the leisure activity and sport of gliding (also called soaring). This unpowered aircraft can ...
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use naturally occurring currents of rising air in the atmosphere to gain altitude. Sailplanes are aerodynamically streamlined and so can fly a significant distance forward for a small decrease in altitude.
In North America the term ´sailplane´ is also used to describe this type of aircraft. In other parts of the English-speaking world, the word ´glider´ is more common." - (en.wikipedia.org 29.02.2020)
