Clouds are visible masses of tiny water droplets or ice crystals suspended in the atmosphere. They form when warm air rises, cools, and condenses, creating different types of clouds based on their shape and altitude. Common types include cumulus, stratus, and cirrus clouds, each with distinct characteristics. Clouds play a crucial role in the Earth's weather and climate. They help regulate temperature by reflecting sunlight and trapping heat. Additionally, clouds are essential for precipitation, as they release water in the form of rain, snow, or hail, contributing to the planet's water cycle and supporting ecosystems.