PubMed is a database of citations and abstracts for millions of articles from thousands of journals. It includes links to full-text articles at several thousand journal web sites as well as to most of the articles in PubMed Central.
PubMed Central (PMC) is an electronic archive of full-text journal articles, offering free access to its contents. PMC contains nearly 2 million articles, most of which have a corresponding entry in PubMed.
PubMed does not have citations for certain types of PMC material, such as book reviews, that are considered out of scope for PubMed. These items constitute a small portion of the total PMC collection and there are no plans to include them in PubMed.