ER model is often used in information system design; For example, in the conceptual structure design stage, they are used to describe the information requirements and/or the types of information to be stored in the database. However, data modeling technology can be used to describe any ontology in a specific field (that is, the field of interest) (that is, an overview and classification of the terms used and their relationships).
Extended data:
ER model, entity relation model or entity relation model (ERD) for short, was invented by Chinese-American computer scientist Chen Pinshan, and it is a data model or pattern diagram for high-level description of conceptual data model.
In the design of information system based on database, in the later stage (usually called logical design), conceptual model should be mapped to logical model such as relational model; It should be mapped to the physical model in turn during physical design. Please note that these two stages are sometimes called "physical design".
Baidu encyclopedia -E-R model