Stellar multiplicity is a field of research within astronomy that focuses on the study of multiple star systems. These systems consist of two or more stars that are gravitationally bound and orbit around a common center of mass. Studying stellar multiplicity can provide insights into the formation and evolution of stars, as well as their interactions within a multiple star system. Researchers use various observational techniques, such as spectroscopy and imaging, to identify and characterize multiple star systems in the Milky Way and other galaxies. The study of stellar multiplicity helps astronomers understand the dynamics of star formation, the distribution of stellar masses, and the overall population of stars in the universe.