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

: Represented as rectangles, these are the "nouns" of the system, such as Customer , Order , or Product .

: Analysts use them to identify logic errors in existing database structures.

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

: A high-level view showing major entities and their relationships without technical details.

: They provide a common visual language for stakeholders, business analysts, and engineers to discuss data requirements.