Answer:
There is an ongoing debate about why dolphins jump out of the water.
Scientists think about different reasons for this behavior.
Among them, some believe that dolphins jump while traveling to save energy as going through the air consume less energy than going through the water.
Some others believe that jumping is to get a better view of distant things in the water, mainly prey. So, in this way, dolphins jump to locate food or food related activity like seagulls eating or pelicans hunting.
Other explanations suggest that dolphins use jumping to communicate either with a mate or with another pod as they can hear and interpret the splashes.
Some people even think that dolphins jump for cleaning, trying to get rid of parasites while jumping.
Finally, some scientists believe that they are only having good fun, as playing helps to keep senses at their best.