Which type of clouds are described as big and fluffy?

Cumulus clouds are indeed the types of clouds that are described as big and fluffy. These clouds are typically characterized by their white, puffy appearance and often resemble cotton balls. They form as a result of warm air rising and cooling, leading to the condensation of water vapor. The rising warm air creates the buoyant, towering structures of cumulus clouds, which can vary in size but generally have a rounded top and a flat base.

Cumulus clouds are often associated with fair weather, although they can develop into larger storm clouds if conditions are right. Their distinct shape and appearance are what make them easily recognizable and often represented in illustrations and art. This unique characteristic sets them apart from other cloud types like stratus, which are flat and layered, cirrus, which are thin and wispy, and nimbus, which refers to clouds that produce precipitation but does not describe their shape.