An ER Diagram of the canteen management system is shown below. Entity Relationship Diagram (ER Diagram), often known as ERD, is a diagram that depicts the relationship between entity sets contained in a database. In other words, ER diagrams aid in the explanation of database logical structure. Entities, attributes, and relationships are the three main elements around which ER diagrams are built. ER Diagrams employ a variety of symbols, including rectangles to represent entities, ovals to describe characteristics, and diamond shapes to show connections. At first glance, an ER diagram appears to be a flowchart. However, the ER Diagram incorporates numerous specific symbols, and the semantics of these symbols distinguish this model. The ER Diagram's goal is to depict the entity framework infrastructure.