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A single occurrence of an entity type defines entity instance. A collection/group of locations, people, occasions, things, or concepts of interest is referred to as an entity.
A single special thing being mastered in the real world. A single person, one item, or one company are examples of entities. A subject of stored information, such as a person, group, category of objects, or idea. explains the kind of knowledge that is being mastered. In a database, an entity type often maps to one or more related tables.
An attribute is a property that describes an entity type, such as the Date of Birth property for the Person entity type.
The entity's representation as it is kept in several source systems. Each member record's information is saved as a single record or as a collection of entries spread across linked database tables. An entity type often maps to one or more linked database tables.
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