The large clouds that look like huge puffs of cotton are called cumulus clouds.

Here's a little more about them:

* Formation: Cumulus clouds form when warm, moist air rises and cools. As the air cools, the water vapor condenses into tiny water droplets, creating the fluffy, white appearance.

* Appearance: Cumulus clouds are typically white and puffy, with flat bases and rounded tops. They can range in size from small, isolated clouds to large, towering formations called cumulonimbus clouds, which can produce thunderstorms.

* Weather: Cumulus clouds usually indicate fair weather. However, if they grow tall and dark, it could mean a thunderstorm is developing.

Let me know if you have any other questions about clouds!