The Relational Model is the implementation or representational model, while the ER Model is the high-level or conceptual model
Transforming or translating an ER model (usually expressed as an ER diagram) to a relational model is one of the necessary steps when developing a database application. Ultimately the relational model (after Normalization) will be implemented as a set of tables and columns in a database management system.
ER diagrams are used to analyze existing databases to find and resolve problems in logic or deployment. Drawing the diagram should reveal where it's going wrong. Business information systems: The diagrams are used to design or analyze relational databases used in business processes.
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