Can you explain what is meant by consistency property in the context of transactions and ACID principles?

The consistency property in the context of transactions and ACID principles means that after a transaction is executed, the database transitions from one valid state to another. That is, all rules and constraints (such as data integrity, key uniqueness) must be maintained, and data should not violate the specified business rules.

If a transaction violates these rules, it is rolled back, and the database remains in its original state. This guarantees that the data will always be valid and consistent.