The Astrophysics Data System (ADS) is a system for organizing, storing, and accessing astronomical research data and literature. The ADS is maintained by the Smithsonian Astrophysical Observatory (SAO) and is supported by NASA. The system provides access to over 11 million records, including articles, conference proceedings, and other types of literature in astrophysics and related fields, as well as data from astronomical surveys and observatories. The ADS also provides powerful search and discovery tools, including bibliographic and citation analysis tools, to help users find and use the information they need. The ADS is widely used by astronomers, researchers, and students in the astronomical community, and it is considered a valuable resource for anyone working in the field of astrophysics.