Stellar mass is a term used in astronomy to refer to the mass of a star, which is a fundamental property that dictates a star's evolution, structure, and behavior. Measured in terms of solar masses (the mass of our Sun), stellar mass can range from a fraction of a solar mass for low-mass stars to several times the mass of the Sun for high-mass stars. Studying stellar mass is crucial for understanding the formation, evolution, and eventual fate of stars, as well as how they influence the surrounding galaxies and the Universe as a whole. Researchers use various observational and theoretical techniques to determine the mass of stars across different stages of their life cycle.