Let us first look into some of the important features of ER model.

• Entity relationship model is a high-level conceptual data model.
• It permits us to define the data involved in a real-world enterprise in terms of objects and their relationships.
• It is widely used to develop a first design of a database.
• It gives a set of useful concepts that make it convenient for a developer to move from a basic set of information to a detailed and defined description of information that can be easily executed in a database system.
• It defines data as a collection of relationships, entities and attributes.