Database ER diagrams are structural diagrams used in database design. An ERD contains a variety of symbols and connectors that depict two critical pieces of information, such as the major entities within the system scope and their inter-relationships. The ER model is an Entity-Relationship model. It is a very high-level data model. This model is used to specify the data elements and relationships for a particular system. It creates the database's conceptual design. It also makes a very simple and easy-to-design data view. Database ER diagrams provide a more comprehensive understanding of the overall database structure.