K2-18b is an exoplanet located about 124 light-years away from Earth in the constellation of Leo. It orbits the star K2-18, which is a red dwarf. K2-18b is classified as a super-Earth, meaning it is larger than Earth but smaller than gas giants like Neptune. This planet is particularly interesting because it lies within the habitable zone of its star, where conditions might allow for liquid water to exist. In 2023, scientists detected signs of water vapor in the atmosphere of K2-18b, raising the possibility that it could support life. The discovery was made using data from the James Webb Space Telescope, which has advanced capabilities for studying distant planets. K2-18b's unique characteristics make it a key target for future research in the search for extraterrestrial life.