entity-relationship diagram

An entity-relationship diagram (ERD) is a visual tool used to illustrate the relationships between different entities in a database. Entities represent objects or concepts, such as people, places, or items, while relationships show how these entities interact with each other. For example, in a school database, "Students" and "Classes" could be entities, and the relationship might indicate which students are enrolled in which classes. ERDs help organize information and clarify how data connects, making it easier to design and understand databases.