Answer:
The E-R diagram is basically used in the designing and debugging the relational database in the field of the information system and software engineering.
In the E-R diagram, entity is the object and the component of the data that is used to represent as rectangle.
This E-R diagram is basically used to control the conjunction in the DFD (Data flow diagram). Entities, attribute and action are the three main components that are used in the E-R diagram.