What is an ER diagram? ER diagram, short for Entity Relationship Diagram, also known as ERD, is a diagram that shows the relationships of a set of entities stored in a database. In other words, ER diagrams help explain the logical structure of a database. ER diagrams are built on three basic concepts: Entities, Attributes, and Relationships. ER diagrams contain various symbols ... https://www.tutorialandexample.com/er-diagram-for-university-database-in-dbms