Global circulation refers to the large-scale movement of air and water around the Earth, driven by the uneven heating of the planet by the Sun. This process helps distribute heat and moisture, influencing weather patterns and climate in different regions. The circulation system includes major components like the Hadley Cell, Ferrel Cell, and Polar Cell, which work together to create wind patterns and ocean currents. These systems play a crucial role in regulating temperatures and precipitation, affecting ecosystems and human activities worldwide.