Entities
An entity groups objects that share the same characteristics and have similar behavior. Entities are management elements considered useful for representing enterprise activity, and are therefore reserved for this purpose. They may, for example, have corresponding tables in a database.An entity is described by a list of attributes.
An entity is linked to other entities via associations. The set of entities and associations forms the core of a data model.
We can illustrate the entity concept by comparing entities to index cards filed in drawers.
Entities can represent management objects.
Examples: Customer, Order, Product, Person, Company, etc.
Entities can represent technical objects used in industry.
Examples: Alarm, Sensor, Zone