Lift is just the name we give to the upward force that is generated by the wind moving across the wings of an airplane. An airplanes wings have a very particular shape, where they are slightly rounded at the top and flat on the bottom. This causes wind to move faster across the top of the wing than across the bottom when the airplane is moving forward. Because faster moving air has a lower pressure than slower moving air, the wings get pushed by the higher pressure and pulled by the lower pressure, so they experience an upward force we call lift.
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