+A **Foreign Key** is a column or set of columns in a [Relational Database](/wiki/relational_database) that refers to the [Primary Key](/wiki/primary_key) of another table. It establishes a link between data, ensuring [Referential Integrity](/wiki/referential_integrity) by preventing actions that would destroy these connections between tables.
+## See also
+- [Primary Key](/wiki/primary_key)
+- [Relational Database](/wiki/relational_database)
+- [Referential Integrity](/wiki/referential_integrity)
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