A set of data that describes an instance of the entity represented by a relation is known as a tuple.

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A tuple is a single row of data in a relation (or table) in a database. It contains a set of attributes (or columns) that describe a specific instance of the entity represented by the relation. For example, in a relation representing employees, a tuple might contain data about a specific employee such as their name, job title, salary, and date of hire.

A Set of Data That Describes an Instance of the Entity