A librarian is a person who is trained and responsible for managing and organizing a library. Librarians are responsible for acquiring, cataloging, and maintaining the library’s collection of books and other materials, and for providing access to these resources to library users. Librarians may also be responsible for managing the circulation of materials, providing reference services to help users find information, and offering instruction and guidance on using the library and its resources. In addition to their work in traditional libraries, librarians may also work in digital libraries, archives, and other types of information centers. The profession of librarianship requires specialized education and training, and librarians often hold advanced degrees in library science or a related field.