Stellar binaries are systems in which two stars are gravitationally bound to each other and orbit around a common center of mass. There are various types of stellar binaries, including binary stars, in which the stars are physically close to each other, and wide binaries, in which the stars are separated by a large distance. Stellar binaries are important in astrophysics because they can provide valuable information about stellar evolution, stellar mass, and the formation of star systems. Researchers study stellar binaries through observations, simulations, and theoretical modeling to better understand their properties and dynamics.