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Set of rules that define the behavior of transactions in a system is called the ACID properties:

• Atomicity: the transaction is executed completely or not at all.
• Consistency: after the transaction completes, the system remains in a correct state.
• Isolation: parallel transactions do not affect each other.
• Durability: after confirmation, the changes made by the transaction are preserved even in case of failures.

These rules ensure correctness and reliability in data handling within systems that support transactions.