Saturn is the 6th planet from the Sun. It is a gas giant composed mainly of hydrogen and helium. Saturn is visible to the naked eye and was discovered before the invention of telescopes.
Saturn is unique for its ring system. All giant planets have rings, but Saturn's 7 rings are the most visible.
Saturn is the only planet in our solar system with an average density less than water. The planet could float in a bathtub if one could be made that large.