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Hover in one place. Planes must have air moving over their wings in order to maintain lift. That only happens if the plan is moving. The blades of a helicopter get their lift from the same phenomena, but since they are in circular motion, the helicopter does not have to move horizontally to keep air moving over them.
In all fairness, there are some VTOL aircraft that can hover in place but they do it by directing the exhaust from their jets downward or by rotating their wings so that they are getting the same effect as a helicopter.
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