A CUMULUS cloud, also known as a puffy cloud, is a type of cloud that is characterized by its fluffy and lumpy appearance. It is one of the three main cloud types, along with stratus and cirrus clouds. CUMULUS clouds are often seen in fair weather and are made up of water droplets or ice crystals. They are typically white or gray in color and can range in size from small to large. The term 'puffy cloud' is often used to describe CUMULUS clouds due to their unique shape and texture.