Medical databases are online repositories of medical information that contain a variety of resources such as journal articles, research studies, clinical trials, patient records, and references to medical textbooks. These databases provide healthcare professionals, researchers, and students with access to up-to-date and evidence-based information on various medical conditions, treatments, and procedures. They are essential tools for conducting research, making evidence-based decisions, and staying informed about the latest developments in the field of medicine. Popular medical databases include PubMed, Medline, and Embase.