Referential Integrity
Referential integrity is a database concept that ensures relationships between tables remain consistent by enforcing that foreign key values in one table must match primary key values in another table. It prevents orphaned records and maintains data accuracy by requiring that any reference to data in a related table must exist. This is typically enforced through constraints in relational database management systems (RDBMS).
Developers should implement referential integrity when designing relational databases to ensure data consistency and prevent invalid relationships, such as orders referencing non-existent customers. It is crucial in applications requiring reliable data relationships, like e-commerce systems, financial software, or any scenario where data integrity is paramount. Using referential integrity constraints simplifies application logic by offloading validation to the database layer.