Definitions of Entity, Relationship, Attribute

Entity: A data entity is anything real or abstract about which we want to store data. Entity types fall into five classes: Rules, Events, Locations, Tangible thing and Concepts. Example: Emlpoyee, payments, campus etc.

Relationship: A data relationship is a natural association that exists between one or more

entities. Example: Employees process payments, Department run by Supervisor etc.

Attribute: A data attribute is characteristic common to all or most instances of a particular entity. Synonyms include property, data element, field. Example: ID, Name, Address, Email etc.