Ice giants are a class of giant planets composed mainly of elements heavier than hydrogen and helium, such as water, ammonia, and methane. In our solar system, Uranus and Neptune are the two known ice giants. Unlike gas giants like Jupiter and Saturn, which are mostly hydrogen and helium, ice giants have thick atmospheres overlying icy mantles and rocky cores. Their striking blue hues come from methane in their atmospheres, which absorbs red light and reflects blue. Ice giants are colder and less massive than gas giants, and their unique compositions offer clues about planetary formation and the outer solar system. Despite being far from the Sun, they possess strong magnetic fields and dynamic weather systems, including supersonic winds and large storms. As space exploration continues, studying ice giants helps scientists understand similar exoplanets and the diverse types of worlds that exist beyond our solar neighborhood.