Entity–relationship model
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 / From Wikipedia, the free encyclopedia
In software engineering, an entity–relationship model is a conceptual model of data. Very often, the term is shortened to ER model. ER models are used to create relational databases. They show how the different parts of a data model interact with each other.
Peter Chen proposed to use this modelling approach in an article he wrote in 1976.[1] Chen was not the first to have this idea.[2] After the publication of the article, the idea was modified as well.