There are several synonyms for the term "Library of Congress," including the "Congressional Library," the "National Library," and the "Library of the United States." These terms all refer to the same institution, which is the largest library in the world with over 170 million items in its collections. The Library of Congress was established in 1800 and serves as the research arm for the United States Congress. It is also open to the general public for research and education purposes. The Library of Congress is home to countless rare and unique materials, including manuscripts, maps, photographs, and prints, making it a valuable resource for scholars, researchers, and history enthusiasts alike.