The Library of Congress is the largest library in the world, with millions of books, films and video, audio recordings, photographs, newspapers, maps and manuscripts in its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office.

The Library of Congress (LOC) is a research library in Washington, D.C., that serves as the library and research service of the U.S. Congress and the de facto national library of the United States. Founded in 1800, the library is the United States's oldest federal cultural institution.

The Library of Congress, housed in three buildings on Capitol Hill in Washington, D.C., is the research library of the U.S. Congress, and is considered the national library of the United States. It’s also the largest library in the world, with a collection of more than 170 million items.

Today's Library of Congress is an unparalleled world resource. The collection includes millions cataloged books and other print materials in 470 languages; millions of manuscripts; the largest rare book collection in North America; and the world's largest collection of legal materials, films, maps, sheet music and sound recordings.

The Library of Congress provides Congress with objective research to inform the legislative process, administers the national copyright system, and manages the largest collection of books, recordings, photographs, maps and manuscripts in the world.