PubMed was developed and is maintained by the National Center for Biotechnology Information (NCBI), at the U.S. National Library of Medicine (NLM), located at the National Institutes of Health (NIH).

• consists of MEDLINE, PubMed Central (PMC), and Bookshelf.

• contains more than 30 million citations and abstracts of biomedical literature. 

• provides free access to MEDLINE and links to full-text articles when possible.

• covers journal articles in medicine, nursing, dentistry, veterinary medicine, and the health care system.

MEDLINE, PubMed, and PMC (PubMed Central): How are they different?