An ER Diagram (Entity Relationship Diagram) is a visual representation used to illustrate the structural design of a database. It shows the entities involved, their properties (attributes), and how those entities relate to one another. It helps database designers understand the overall structure of the database before creating the actual tables. ER diagrams use symbols such as rectangles for entities, ovals for attributes, and diamonds for relationships. They are commonly used during the database design process to make the database structure clear and easy to understand.
