PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites. MEDLINE (Medical Literature Analysis and Retrieval System Online) is the largest component of PubMed and consists primarily of journal citations; articles indexed with MeSH (Medical Subject Headings) and curated with funding, genetic, chemical and other metadata.
TRIP (Turning Research Into Practice) is a free medical database providing access to high quality clinical research evidence. TRIP Pro is the enhanced version containing over 100,000 systematic reviews, medical images and videos, millions of full-text articles, and advanced searching.