Clouds are visible accumulations of tiny water droplets or ice crystals in the Earths atmosphere. They are an important part of Earth's weather and are created when water vapor, an invisible gas, turns into liquid water droplets. These droplets form on tiny particles like dust, salt crystals from sea spray, bacteria, or even ash from volcanoes, which provide surfaces on which water vapor can change into liquid droplets or ice crystals. The water droplets are so small that they stay suspended in the air, and it is this group of little water droplets suspended in the air that becomes visible as the cloud we see. If the cloud is high up enough in the sky and the air is cold enough, the cloud is made of lots of tiny ice crystals.
While it's true that clouds contain water, they actually aren't made of water vapor. If they were, you wouldn't be able to see them. The water that makes up clouds is in liquid or ice form. The air around us is partially made up of invisible water vapor. It's only when that water vapor cools and condenses into liquid water droplets or solid ice crystals that visible clouds form.
