What is the source of vortex flow in wing of aircrafts?

Question

please explain?how the vortex is made?

Answer 1

When the airplane flies, the motion of the wing through the air makes high pressure under the wing, and low pressure on top of the wing. At the wingtip, the air pushes up from below (the high pressure area), around the end of the wing, to the top of the wing (low pressure). This moving air keeps spinning once it leaves the wing. This is the vortex, one on each wing tip, and tiny ones off the horizontal stabilizer tips.