Here's a breakdown of their characteristics:

* Shape: Cumulus clouds are known for their puffy, cotton-like appearance, often resembling cotton balls or cauliflower.

* Altitude: They are typically found at low altitudes, ranging from about 2,000 to 6,500 feet.

* Formation: Cumulus clouds form when warm, moist air rises and cools. As the air cools, the moisture condenses into tiny water droplets, forming the familiar fluffy shape.

* Weather: Cumulus clouds generally indicate fair weather. However, if they become very tall and dense (cumulonimbus clouds), they can produce thunderstorms.

There are different types of cumulus clouds, including:

* Cumulus humilis: Small, fair-weather cumulus clouds.

* Cumulus congestus: Tall, towering cumulus clouds that can develop into thunderstorms.

* Cumulonimbus: Large, powerful thunderclouds that can produce heavy rain, hail, lightning, and tornadoes.