Symphony of the Seas is a Royal Caribbean Oasis-class cruise ship, which at its launch in 2017 was the biggest cruise ship by gross tonnage. Royal Caribbean built the World's largest cruise ship as they wanted to create the best cruise ship for families ever. They have managed this by including such an array of variety and quality of cabins, restaurants, bars, entertainment as well as sports and leisure facilities.

The sheer size of the Symphony is offset by the Royal Caribbean' Save the Waves programme, which means there are constant green improvements being made to the ship, it leaves no waste behind and has banned the use of plastic straws on board.