Acid compliance refers to a set of properties that ensure reliable processing of database transactions. The acronym ACID stands for Atomicity, Consistency, Isolation, and Durability:

1. Atomicity: Ensures that all operations within a transaction are completed. If any operation fails, the entire transaction is rolled back, leaving the database unchanged from its previous state.
2. Consistency: Guarantees that a transaction brings the database from one valid state to another, maintaining the predefined rules and constraints.
3. Isolation: Ensures that transactions are securely and independently processed at the same time without interfering with each other.
4. Durability: Ensures that once a transaction is committed, it will remain so, even in the event of a system failure.

These properties are crucial for applications where accurate and reliable transaction processing is paramount, such as in banking systems. For example, ensuring that money is neither lost nor duplicated during transfers is critical 1 2 3.