More generally, it is the flow of the gases which compose an atmosphere; since wind is not unique to Earth. Simply it occurs as air is heated by the sun and thus rises. Cool air then rushes in to occupy the area from which the hot air has now moved. It could be loosely classed as a convection current.
Winds are commonly classified by their spatial scale, their speed, the types of forces that cause them. While wind is often a standalone weather phenomenon, it can also occur as part of a storm system, most notably in a cyclone.
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