ER Diagrams

An Entity-Relationship (ER) Diagram is a visual tool used to represent the structure of a database. It shows the different types of data (entities) such as customers or products, and how these data types relate to each other (relationships). For example, a customer "places" an order, and the diagram illustrates this link. ER diagrams help designers organize and plan how data will be stored and connected, making complex databases easier to understand and develop. They are a foundational step in designing efficient and logical data systems.