Habitability is a research area within the field of astrobiology that focuses on determining the conditions necessary for a planet or moon to support life as we know it. Researchers in this area study factors such as a planet's distance from its star, presence of water, composition of the atmosphere, and availability of nutrients to determine the likelihood of a celestial body being habitable for life forms. By understanding habitability, scientists aim to identify potentially habitable planets beyond our solar system and ultimately answer the question of whether life exists elsewhere in the universe.