Wind is generated primarily by the uneven heating of the Earth's surface by the sun. This uneven heating causes differences in air temperature and pressure. Warm air rises because it is less dense, and cooler, denser air moves in to replace it, creating air movement called wind. Additionally, factors like the Earth's rotation (which causes the Coriolis effect), the irregularities of the earth's surface, and differences in terrain influence wind patterns and direction. In essence, wind forms as air moves from areas of higher pressure to lower pressure created by temperature differences across the Earth's surface.