The National Library of Medicine (NLM) is a part of the United States Department of Health and Human Services. It is the world's largest biomedical library, providing access to a vast collection of medical literature, research, and information resources. The NLM aims to improve public health by facilitating access to health information for researchers, healthcare professionals, and the general public. NLM is known for its various databases, including PubMed, which offers access to millions of citations and abstracts from biomedical literature. Additionally, the NLM supports research and education through its programs and initiatives, promoting the use of health information technology and data science in healthcare.