The gaseous state of water is called water vapor. Water vapor appears when water evaporates and is a product of plant, animal and human respiration.
Water vapor can be made through evaporation of boiling water. It is the only form of water that is invisible and is lighter than air. Water vapor is present as steam and is useful for cooking and as a major component in transportation.
Water vapor is an important part of the Earth's atmosphere and is abundant throughout the solar system. It has been found in the atmospheres of all the major planets and even near the sun.