ACID Transactions
ACID transactions guarantee that a group of database operations is Atomic, Consistent, Isolated, and Durable — so related changes either all succeed or all fail together.
ACID is what makes relational databases reliable. Atomicity ensures all-or-nothing changes; Consistency keeps data valid; Isolation prevents concurrent transactions from interfering; Durability survives crashes.
Transactions are critical for operations like checkout, where an order and its line items must commit together — a guarantee document databases often can't provide.
PostgreSQL provides full ACID compliance, which is why it's trusted for financial, e-commerce, and other correctness-critical workloads.
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