Gas giants are a type of planet that are primarily composed of gases like hydrogen and helium, with relatively small solid cores. They are typically much larger in size and mass than terrestrial planets, with thick atmospheres and high gravitational forces. Gas giants are characterized by their lack of a solid surface, and their rings and numerous moons. The most well-known examples of gas giants in our solar system are Jupiter and Saturn. These planets are considered to be important in the study of planetary and solar system formation, as well as in our understanding of the atmospheres and magnetospheres of giant planets.