Entity-Relationship Diagram (ERD)

An Entity-Relationship Diagram (ERD) is a visual tool used to represent how data is organized within a system. It shows the key components—called "entities" (such as people, places, or things)—and how they relate to each other through connections called "relationships." For example, a customer might place an order, linking the customer to the order. ERDs help organize and clarify complex data structures, making it easier to design databases and understand how different pieces of information interact within a system.