What is ACID in databases?

ACID is a set of properties of database transactions that ensure reliability and data integrity:

• Atomicity: The transaction is completed in full or not at all.
• Consistency: After the transaction, the database remains in a correct state, satisfying all constraints.
• Isolation: Parallel transactions do not affect each other, as if they were executed sequentially.
• Durability: After a transaction is committed, the changes are saved even in case of failures.

These properties guarantee that data operations are reliable and predictable, which is especially important in critical applications.