The Library of Congress is the world's largest library. Its mission is to make its resources available and useful to Congress and the American people and to sustain and preserve a universal collection of knowledge and creativity for future generations. Through its website, the LOC is offering broad public access to a wide range of information. It presents these materials as part of the record of the past. Information resources and tools presented include the LOC catalogs, American Memory historical collections for the National Digital Library, THOMAS (U.S. Legislative Information), exhibitions, library services, and research tools.