FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -An entity relationship diagram (ERD), also known as an entity relationship model, is a graphical representation that depicts relationships among people, objects, places, concepts or events within an information technology (IT) system.

Detailed explanation-2: -ER model makes use of ER diagrams, which are the diagrams sketched to design a database. ER diagrams are built on three basic concepts: entities, attributes, and relationships between them.

Detailed explanation-3: -ER models, also called an ER schema, are represented by ER diagrams. ER modelling is based on two concepts: Entities, defined as tables that hold specific information (data) Relationships, defined as the associations or interactions between entities.

Detailed explanation-4: -Uses of entity relationship diagrams Database design: ER diagrams are used to model and design relational databases, in terms of logic and business rules (in a logical data model) and in terms of the specific technology to be implemented (in a physical data model.)

Detailed explanation-5: -ERD diagrams are commonly used in conjunction with a data flow diagram to display the contents of a data store. They help us to visualize how data is connected in a general way, and are particularly useful for constructing a relational database.