Wingtip vortices are circular patterns of rotating air that occur when a wing is generating lift. High pressure air from below the wing is drawn around the wingtip into the region above the wing by the pressure differential. This rotation of air around the end of the wing causes a vortex to trail from each wingtip that forms the primary component of wake turbulence , which can be extremely dangerous to other planes. The strength of wingtip vortices is determined by the weight and airspeed of the aircraft. Most modern aircraft use winglets to minimize the size of the vortices and increase efficiency by reducing induced drag.
Source: https://youtu.be/QZkggFzAtEc
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