PubMed is a free literature database that contains more than 38 million references to biomedical and life sciences literature. The primary component of PubMed is MEDLINE, which is produced by the National Library of Medicine in the U.S. and contains more than 31 million references from over 5,200 scholarly journals published around the world. In addition to MEDLINE content, PubMed includes citations that are being processed for MEDLINE, citations that are out-of-scope from MEDLINE journals, "ahead of print" citations that precede the article's final publication in a MEDLINE journal, and more. Mobile access is available for PubMed.
The same content in PubMed can also be searched in Ovid MEDLINE .