A "Rain Cloud" is a type of cloud that produces precipitation, primarily in the form of rain. These clouds are typically dark and thick, indicating that they are filled with water droplets. The process of rain formation occurs when water vapor in the atmosphere cools and condenses into tiny droplets, which eventually combine to form larger droplets that fall to the ground. Rain clouds can vary in size and shape, with common types including cumulonimbus and nimbostratus. Cumulonimbus clouds are often associated with thunderstorms, while nimbostratus clouds bring steady, continuous rain. Understanding rain clouds is essential for predicting weather patterns and preparing for rainfall.