In software engineering, an entity-relationship model (ERM) is an abstract and conceptual representation of data. Entity-relationship modeling is a database modeling method, used to produce a type of conceptual schema or semantic data model of a system, often a relational database, and its requirements in a top-down fashion. Diagrams created by this process are called entity-relationship diagrams, ER diagrams, or ERDs.
The definitive reference for entity-relationship modelling is Peter Chen's 1976 paper.[1] However, variants of the idea existed previously,[2] and have been devised subsequently.
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