PubMed is an interface for searching biomedical and life sciences journal articles and other related content:
- MEDLINE citations and links to some full-text articles.
- PubMed Central papers which are open access full-text articles.
- Articles that are "in process" prior to being indexed with MeSH terms.
- Articles submitted by publishers "ahead of print."
- National Center for Biotechnology Information (NCBI) Bookshelf.
Currently, PubMed contains over 30,000,000 citations.