E-R Model is an acronym for Entity Relationship Model. It is seen that this model is based on real-world examples. It contains the required objects (called entities) and the relationships between those objects. Here, the main objects are an entity, an attribute of that entity, a set of relationships, and the attributes of that set of relationships can be mapped in the form of an E-R diagram. In the E-R diagram, entities are represented by rectangles, relationships are represented by diamonds, attributes are entity features and are represented by ellipses, and data flows are represented by lines.