This ER diagram of Hospital depicts the clinic's database and associated fields. This section discusses various entities, their characteristics, and their relationships. This aids the clinic's efficiency and patient retention. There are three major entities visible: patients, doctors, and tests. The ER diagram of Hospital connects the various entities and demonstrates the information contained in the database. A log of tests and examinations can be associated with each patient who visits the hospital. ER diagrams are used to design hospital management systems. These ER diagrams assist them in visualizing all of the database tables as well as identifying the relationships between various entities and their attributes.