Definition
Atomicity, Consistency, Isolation, Durability — the four properties that guarantee database transactions are processed reliably.
In Depth
Atomicity: transactions are all-or-nothing. Consistency: transactions leave the database in a valid state. Isolation: concurrent transactions don't interfere with each other. Durability: committed data survives system failures. ACID compliance is what makes relational databases reliable for financial and business-critical data.
Example Usage
Ensuring that when a user submits a contact form, both the contact record and the notification email record are created atomically — if either fails, neither is saved.
Business Context
ACID properties are why businesses trust relational databases for financial data — they guarantee that money doesn't appear or disappear due to technical glitches.
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