A simple picture explaining the evaporation of water, though in real life you can not see the water, but only steam

Evaporation ponds in Camargue (Southern France): If all the water in salt water evaporates, the salt remains.

Evaporation is when a liquid becomes a gas without forming bubbles inside the liquid volume. If bubbles are formed we are talking instead about "boiling".

For example, water left in a bowl will slowly disappear. The water evaporates into water vapor, the gas phase of water. The water vapor mixes with the air.

The opposite of evaporation is condensation.