An entity is anything, concrete or abstract, including associations between entities, abstracted from the real world and modeled in tabular form that will store information the database .

Entity

Entities are individually identifiable objects and/or persons. Individual properties can be attributed to them (such as color = red, date of birth = August 28, 1749, altitude = 2962 meters, temperature = -4.5 degrees) – within a given area.

The set of entities of an entity type is called an entity set – which (depending on the selection) may include all, only some, or none of the entities. Entities as elements of an entity set are distinguished by their properties (attribute values).

Each entity of an entity type is distinguished from other entities of the same entity type by a unique value of an identifying attribute or a combination of attributes (for example, the chassis number for a single car or the license plate number for a single registration). This attribute or combination of attributes is called an identifier, or ID for short.