To cloudland and they have a cloudparty eating cloudlollies. But most evaporate again (because clouds are condensed water molecules) or become too heavy with water that it rains.
Clouds form when rising air, through expansion, cools to the point where some of the water vapor molecules "clump together" faster than they are torn apart by their thermal energy. Some of that...
Clouds.
You can rank clouds according to their height and whether or not they are flat or puffy.
Flat Puffy
Low Stratus Cumulus
Medium Alto stratus Alto cumulus...