What are different types of Clouds?

When air is cooled below its dew point temperature, the excess water vapour condenses into minute particles of water, which remain suspended in the air. Millions of such particles, close together, become visible as cloud.
Clouds can form at any height from sea level upto the tropopause, which is about 8 km above the poles, about 13.5 km above temperature latitudes and about 16 km above the equator. They are hence grouped according to their height of base above sea level.

1. Low Clouds consist entirely of water droplets and have their basses between sea level and 2 km.
2. Medium Clouds have prefix “Alto” to their names and consist of both, water droplets and ice particles but more of the former. Their bases will be between 2 km and 6 km above sea level.
3. High clouds have the prefix “Cirro” to their names and consist entirely of ice crystals. Their bases will be between 6 km above sea level and the tropopause.