What is meant by a set of rules that define the behavior of transactions in a system?

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

• Atomicity: a transaction is completed fully or not at all.
• Consistency: after a transaction completes, the system remains in a correct state.
• Isolation: concurrent transactions do not affect each other.
• Durability: after a transaction is committed, its changes are saved even in case of failures.

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