Clouds are classified into several types based on their appearance and altitude. The main types include cumulus, stratus, and cirrus. Cumulus clouds are fluffy and white, often resembling cotton balls, and typically indicate fair weather. Stratus clouds are flat and gray, covering the sky like a blanket, and can bring light rain. Cirrus clouds are thin and wispy, found at high altitudes, and usually signal that a change in weather is coming. In addition to these, there are also nimbus clouds, which are associated with precipitation. Cumulonimbus clouds are towering and can produce thunderstorms, while nimbostratus clouds are thick and dark, bringing steady rain. Understanding these types helps in predicting weather patterns and conditions.