File:ER_Diagram_MMORPG.svg · Wikimedia Commons · See Wikimedia Commons
entity-relationship model
Sign in to saveAlso known as ER model, entity-relationship modeling, ER modeling, EAR model, EAR modeling, ERD, ER schema, ERM
describes inter-related things of interest in a specific domain of knowledge;composed of entity types (which classify the things of interest) and specifies relationships that can exist between instances of those entity types
~25 min read
Encyclopedic overview
An entity–attribute-relationship diagram for an MMORPG using Chen's notation
An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types).
Excerpted from Wikipedia’s “entity-relationship model” article, available under the CC BY-SA 4.0 licence.