: Represented as ovals, these describe the specific characteristics of an entity (e.g., a Customer entity might have attributes like Name or Email ).
: The most detailed version, showing actual table structures, data types, and constraints for a specific database management system. AZ erdЕ‘rЕ‘l
: Adds more detail, defining attributes and keys but remaining independent of a specific database technology. : Represented as ovals, these describe the specific