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An Entity Relationship Diagram (ERD), also known as an Entity Relationship Model, is a graphical representation that depicts relationships among people, objects, places, concepts or events within an information technology (IT) system. An ERD uses data modeling techniques that can help define business processes and serve as the foundation for a relational database.
Source: https://searchdatamanagement.techtarget.com/definition/entity-relationship-diagram-ERD