> For the complete documentation index, see [llms.txt](https://mun.gitbook.io/dbms/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mun.gitbook.io/dbms/database/relational-database-management-system-rdbms/entity-relationship-er-model.md).

# Entity-Relationship (ER) Model

Entity-Relationship (ER) Model 

* Entity-relationship model is a model used for design and representation of relationships between data.

* Entity and Entity Set

* Attributes

* Keys

* Relationships

## Entity

* A real-world object which has characteristics and holds relationships in a DBMS. 

## Entity Set

* The complete datasets of an Entity is the Entity Set. 

## Weak Entity

* An entity that depends on another entity called a weak entity.