The United States National Library of Medicine, established in 1836, is the world's largest medical library. Besides being a major resource for biomedical information, it has a wealth of databases, electronic journals, and healthcare resources. However, there are several synonyms for the United States National Library of Medicine, including NLM, National Medical Library, National Library of Medicine, and USNLM. With its vast collection of literature and online resources, the NLM serves as a crucial tool for researchers, scientists, clinicians, and the public alike. Its diverse collection includes rare books, manuscripts, historical archives, and scientific publications, making it an essential hub for the advancement of medical knowledge and practice.