Aspects


vs


Diagram

A diagram is a two-dimensional geometric symbolic representation of information according to some visualization technique.

Entity-relationship

An entity-relationship model (ERM) is an abstract and conceptual representation of data, information aspects of a business domain or its process requirements

Others

Quality Example
More abstract

"Oo class diagram is more abstract and has more features than entity-relationship diagram"

from question "Is there any relationship with ER and class diagram?"

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