"It rains" refers to the process where water droplets fall from the atmosphere to the Earth's surface. This occurs when clouds, which are made of tiny water droplets or ice crystals, become saturated with moisture. When the droplets combine and grow larger, they eventually fall due to gravity. Rain is an essential part of the Earth's water cycle, contributing to the replenishment of rivers, lakes, and groundwater. It supports plant growth and provides water for animals and humans. Different regions experience varying amounts of rainfall, influenced by factors such as geography and climate, including tropical rainforests and deserts.