Raindrops are small droplets of water that fall from clouds in the atmosphere. They form when water vapor condenses into tiny water droplets, which gather together and become heavy enough to fall to the ground due to gravity. Raindrops can vary in size, typically ranging from 0.5 to 6 millimeters in diameter. When raindrops hit the ground or other surfaces, they create a splash and can contribute to the water cycle, which is essential for replenishing rivers, lakes, and groundwater. This process is vital for ecosystems and agriculture, as it provides the necessary moisture for plants and animals to thrive.