Gas giants are large planets that primarily consist of hydrogen and helium. They lack a solid surface and have thick atmospheres with strong winds and storms. The four gas giants in our solar system are Jupiter, Saturn, Uranus, and Neptune. These planets are known for their massive sizes and unique features, such as Jupiter's Great Red Spot, a giant storm. Unlike terrestrial planets, gas giants have a more complex structure, often featuring a core of rock and metal surrounded by layers of gas and liquid. They also have extensive ring systems and numerous moons. The study of gas giants helps scientists understand planetary formation and the dynamics of atmospheres in different environments.