A late-type star is a star that has a spectral classification of K, M, or C. These stars are typically cooler and less massive than earlier type stars, and as a result, they have a shorter lifespan and burn their fuel more slowly. Some synonyms for late-type star include red dwarf, main-sequence star, and cool star. These stars are important to astronomers as they are some of the most common stars in the universe, and they tend to have exoplanets orbiting them. Scientists study these stars to better understand the characteristics of planetary systems and the potential for extraterrestrial life.