Suggest an editImprove this articleRefine the answer for “What is ACID?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)ACID is a set of properties that guarantee the reliability of database transactions: **Atomicity** (all or nothing), **Consistency** (data stays valid), **Isolation** (concurrent transactions don't interfere with each other), and **Durability** (changes survive failures). **Key point:** these properties make transactions predictable and protect data from loss and conflicts.Shown above the full answer for quick recall.Answer (EN)ImageACID is a set of properties that guarantee the reliability of database transactions: 1. **Atomicity**, a transaction either runs fully or not at all. If an error occurs midway, the system rolls back every change. 2. **Consistency**, after a transaction runs, the data stays in a valid state that satisfies the database's rules and constraints. 3. **Isolation**, concurrent transactions don't interfere with each other: each one behaves as if it were running alone. 4. **Durability**, once a transaction completes successfully, its changes survive even a system failure. These properties make transactions predictable and protect data from loss and conflicts.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.