Definitions for "Vortices"
Air from the high pressure region under the wing flows to the low pressure region above the wing when generating lift, the result are vortices. This reduces the effective lifting area of the wing and generates drag. If the wing span was very very long the loss due to this flow from bottom to top would be very low and the induced drag very low. This is why high aspect ratio wings are used where low drag and high lift is required e.g. gliders. Search for aerodynamics books on Amazon.co.uk
Twisting air disturbances resulting from the movement of a wing through the air.
Circular patterns of air created from lift generated by the wings (or rotor) of an aircraft or helicopter; the vortices from one aircraft may pose a hazard to following aircraft
Keywords:  wingtip, see
See wingtip vortices