Suggest an editImprove this articleRefine the answer for “What does "Isolation" mean in ACID?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Isolation** means concurrent transactions **shouldn't affect each other** and **shouldn't see each other's intermediate results** - each one runs as if it were **the only one**, even when dozens of operations are happening at once. **Key point:** for example, if one user changes an account balance while another queries it at the same moment, the second one sees **the old value** until the first transaction fully completes.Shown above the full answer for quick recall.Answer (EN)Image**Isolation** means concurrently running transactions **shouldn't affect each other** and **shouldn't see each other's intermediate results**. Each transaction runs as if it were **the only one**, even if dozens of operations are happening in the system at once. Example: if one user is changing an account's balance while another queries it at the same moment, the second one sees **the old value** until the first transaction fully completes. This prevents errors and data discrepancies.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.