This ER Diagram of Hospital Information System is a flowchart type showing how "entities" within a system, such as people, objects, or concepts, interact with one another. ER Diagrams are most commonly used in software engineering, business information systems, education, and research to design or debug relational databases. They use these defined set of symbols such as rectangles and connecting lines to show the interconnectedness of entities and their attributes. They are also known as ER Models. They reflect the grammatical structure, with entities acting as nouns and relationships acting as verbs.