Az - Erdе‘rе‘l

: They serve as high-level documentation of a system’s information architecture. Levels of Abstraction

: Represented as rectangles, these are the "nouns" of the system, such as Customer , Order , or Product . AZ erdЕ‘rЕ‘l

: They provide a common visual language for stakeholders, business analysts, and engineers to discuss data requirements. : They serve as high-level documentation of a

: Represented as diamonds or connecting lines, these show how entities interact (e.g., a Customer "places" an Order ). : Represented as diamonds or connecting lines, these

: Defines the numerical relationship between entities, such as one-to-one , one-to-many , or many-to-many . Why ERDs are Useful

For professional modeling, tools like Lucidchart or Visual Paradigm are widely used to create and share these diagrams. What is an Entity Relationship Diagram (ERD)? - Lucidchart

: Adds more detail, defining attributes and keys but remaining independent of a specific database technology.