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Learn all about Entity Relationship Diagrams (ERDs), what they are used for, how to understand them, how to create them, and more in this guide. Also known as ERDs or ER Models, they use a defined set of symbols such as rectangles, diamonds, ovals and connecting lines to depict the interconnectedness of entities, relationships and their. ER diagram or ER model, is drawn to visually represent the relationships between entities in a database system. Some benefits of drawing ER diagrams for database design are: It. An entity relationship diagram (ER diagram or ERD) is a visual representation of how items in a database relate to each other. ERDs are a specialized type of flowchart that convey the relationship.