What are the main characteristics that a transaction in a system should meet?

The main characteristics of a transaction in a system, often abbreviated as ACID, include:

• Atomicity: The transaction is completed fully or not at all. If one part of the operation fails, all changes are rolled back.
• Consistency: The transaction transitions the system from one correct state to another, maintaining all rules and constraints.
• Isolation: Concurrent transactions do not affect each other; the results of one transaction are not visible to others until it is completed.
• Durability: After a transaction successfully completes, its changes are preserved even in case of system failures.

In Node.js, when working with databases (for example, using ORM or drivers), it is important to use transactions to ensure these properties, especially during complex operations involving multiple queries.