Multiple star systems, also known as multiple star or binary star systems, are systems consisting of two or more stars that are gravitationally bound and orbit around a common center of mass. These systems can be classified into various types based on the number of stars involved and their configuration, such as binary stars (two stars), trinary stars (three stars), or higher-order star systems. The study of multiple star systems is important for understanding stellar evolution, dynamics, and formation processes. Observable properties of multiple star systems can provide valuable insights into the characteristics of individual stars, their mass ratios, orbital parameters, and interactions within the system. Additionally, multiple star systems can have a significant impact on the formation and dynamics of planetary systems if planets are present within the system. Researchers use a variety of observational techniques, such as direct imaging, spectroscopy, and astrometry, to study multiple star systems and analyze their properties. By studying these systems, scientists can gain a better understanding of the complex dynamics of interacting stellar systems and the role they play in the broader context of stellar and planetary evolution.