In most libraries, they do both types of work. Private libraries are associated with corporations, government agencies, law firms, and other specialized groups. In these libraries, the information is usually limited to subjects only of interest to the organization. Librarians at private libraries do in-depth information searches for library users in addition to running the library. School librarians help teachers develop courses, get materials for teaching, and sometimes teach classes.
Many libraries have computerized lists of books.
It is important that librarians have good computer skills so they can use these databases. As use of the Internet and the World Wide Web grow, many librarians are expected to teach people how to use these resources. Librarians is in the Art, Media, and Communications Career Cluster.