What is a rollback operator?

A rollback operator is a command used in database management systems to revert a database to a previous state, typically to undo changes made during a transaction that has not yet been committed. This operator is essential for maintaining data integrity, allowing users to recover from errors or unwanted changes. In SQL, the rollback operator is executed using the ROLLBACK statement, which undoes all operations since the last commit. This ensures that the database remains in a valid state by discarding incomplete or erroneous transactions.