Blue dwarf stars are small, relatively cool stars that are fainter than the sun. There are several synonyms for "blue dwarf" that are commonly used in astronomy. For instance, blue dwarfs are also known as red dwarfs, M dwarfs or M-type stars. They are characterized by their spectral type, which is determined by the surface temperature of the star. Although they are small and dim, blue dwarfs are of great interest to astronomers as they are the most common type of star in the Milky Way galaxy. Understanding their properties and behavior is essential to our understanding of the universe and the evolution of stars.