The Intertropical Convergence Zone (ITCZ) is a virtually continuous belt of convective clouds and intense rainfall encircling the Earth near the equator. It forms where the northern hemisphere trade winds (from the northeast) and southern hemisphere trades (from the southeast) converge, forcing warm, moist air to rise vigorously. This massive ascent generates enormous cumulonimbus towers and the planet's most abundant precipitation. The ITCZ is not static: it oscillates seasonally following the sun's movement, shifting toward the hemisphere experiencing summer. In July–August, it lies between 5°N and 15°N over the continents; in January–February, it drops to positions between 5°N and 10°S. This seasonal migration determines the rainy season in the tropics and is the primary driver of the monsoons of India, Southeast Asia, and West Africa. At global scale, the ITCZ forms part of the Hadley cell: air rising at the ITCZ moves poleward in the upper troposphere, cools, and descends at subtropical latitudes (~30°), creating the high-pressure belts that generate the world's great deserts (Sahara, Arabia, Kalahari). The ITCZ's position and intensity are affected by El Niño and La Niña, altering tropical precipitation patterns with consequences for millions of people.