What is library and information science (LIS)? It's a field of study focused on the collection, organization, preservation, and dissemination of information resources.
Wikipedia offers a birds-eye view of the LIS field and explains the varying descriptions. Kent State University calls LIS a meta-discipline, "spanning what are considered traditional academic research disciplines (e.g., economics, biology, history, etc.)."
LIS graduates can work as Indexers, Webmasters, Applications Developers, Reference Librarians, Documentation Specialists, Archivists, Curators, Metadata Specialists/Analysts, Catalogers, Digital Services Managers, Database Administrators, University Professors, Children's Librarians, Genealogists, Historians and more. LIS graduates may work in: museums, cruise ships, archives, research centers, business/corporate environments, tech, seminaries, churches, PK-12 schools, colleges and universities, hospitals, radio stations, military bases, performing arts centers, their own homes, online environments, and more.
You can also check out the Occupational Outlook Handbook's webpages on "Librarians" within the Bureau of Labor Statistics for more information.