A habitable zone is the region around a star where a planet can orbit and have suitable conditions for liquid water to exist on its surface. Liquid water is a crucial ingredient for life as we know it, so the habitable zone is an important concept in the search for extraterrestrial life. The boundaries of the habitable zone depend on factors such as the type and brightness of the star, as well as the planet’s atmosphere and other properties. Scientists use this concept to identify promising targets for future exploration and to better understand the conditions necessary for life to exist in the universe.