**"A thing capable of an independent existence that can be uniquely identified"** An "Entity" is a thing that is capable of an independent existence that can be uniquely identified. Per Wikipedia. "Entity" is one of the most generic words that exist, in competition with "Object" and "Thing", entity is perhaps _the most_ generic word. Every node in a [[Graph Database]] is, by definition, and _entity_ - no matter whether it represents a [[Class Diagrams|class]] of objects or an _instance_ of a particular class. Entities can be wholly abstract. Entities can relate to one another via any number of relationships, which themselves could be entities. An entity fulfills a _role_ within the relationship. There may be constraints on the cardinality of the relationship between two entities. Commonly: min-max. **** # More ## Source [Entity-relationship model](https://en.wikipedia.org/wiki/Entity%E2%80%93relationship_model) ## Related - [[Entity-Relationship Diagrams]] - [[Entity Relationship Categories]]