What do clouds comprise of ?

Clouds are masses of tiny condensed water droplets or ice crystal. Warm air can hold a great deal of invisible moisture compares to cold air. When warm air-cools, moisture is condensed into visible droplets. Clouds come in a great many shapes and sizes and at a variety of height low clouds below 2500 meters are stratus, Stratocumulus, Nimbostratus, cumulus and Cumulonimbus, medium clouds are Altostratus and Altocumulus and high clouds i.e. above 6100 meters are cirrocumulus and cirrostratus.