An Entity Relationship Diagram (ERD) is a visual representation of the relationships between entities in a database. It illustrates how different entities relate to each other and helps in designing and understanding the structure of a database. In an ERD, entities are represented as boxes, and the relationships between them are depicted with lines connecting the boxes. Additionally, attributes of each entity are often included within the boxes. ERDs are essential tools in database design, enabling developers to organize data efficiently and ensure that the database accurately represents the real-world relationships it models.
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