An is a visual report used to design and model relational databases by illustrating how different "entities" (like people, objects, or concepts) relate to one another within a system. Core Components of an ERD
: They serve as high-level documentation of a system’s information architecture. Levels of Abstraction AZ erdЕ‘rЕ‘l
: Analysts use them to identify logic errors in existing database structures. An is a visual report used to design
: They act as a blueprint for developers to build the actual physical database. showing actual table structures
: The most detailed version, showing actual table structures, data types, and constraints for a specific database management system.