Entity-Relationship Diagram views real world as entities. It introduced in 1976 by P.P.Chen and is known as ER Diagram, E R Model, etc.
The following states the importance of Entity-Relationship diagram −
The ER Diagram assists the design even before the construction of tables begins.
This helps the users to plan how to organize data.
ER Diagrams can work as a documentation to make others understand the core of the database.
It communicates the logical structure of the database to the users.
An ER Diagram is considered as the blueprint of the database.