Which organization is known as the oldest and largest library association in the world?

The American Library Association (ALA) is recognized as the oldest and largest library association in the world, founded in 1876. Its mission is to promote libraries and library education, as well as to support the interests of library professionals and patrons. The ALA provides a platform for librarians to advocate for library resources, standards, and professional development, and it has played a significant role in shaping library practices and policies in the United States.

The ALA's historical significance and continued advocacy work distinguish it from other organizations focused on libraries. While the Library of Congress serves as the research library of the U.S. Congress and plays an essential role in preserving American history, it does not function as a library association promoting the library profession. The International Federation of Library Associations, although influential and global in scope, was established in 1927, making it younger than the ALA. The National Library Association is not a recognized or significant body within the global context of library associations. This context highlights the unique standing of the American Library Association in the library community worldwide.