Definition: 'ON DELETE CASCADE' is an option that can be specified in the foreign key constraint of a child table. When this option is set, deleting a row in the parent table will automatically delete all related rows in the child table that reference the deleted row.

Use Case : This feature is particularly useful in maintaining referential integrity within the database. It ensures that there are no orphaned records in the child table that reference non-existent rows in the parent table.

Example Scenario Consider two tables: Orders (parent table) and OrderDetails (child table).

Orders: Contains order information. OrderDetails: Contains details for each order, with a foreign key referencing the Orders table. If an order is deleted from the Orders table, all corresponding entries in the OrderDetails table should also be deleted to maintain data integrity.