NLM has been indexing biomedical information since 1879. Index Medicus MEDLINE is the predecessor of a printed index called Index Medicus, which became a database knows as MEDLINE. MEDLINE is available free to the public in PubMed, but the same database is also available in many other free and proprietary search engines. The Matas Library supports PubMed, OvidSP, and EMBASE.com. While each database has the same overlapping core, there are differences between each one. Choose the database that has features and search support that meet your needs.