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Wind is air in motion. Wind forms when the sun heats one part of the atmosphere differently than another part. This causes expansion of warmer air, making less pressure where it is warm than where it is cooler.
Atmospheric Pressure. Winds are a result of the tendency of warm air to rise and, conversely, cool air to sink. When the sun's energy heats up a part of the ground or the sea and the heat radiates into the air, the air rises, creating a low pressure area underneath it.