Answer / Dinesh Kumar Pandey

Transaction isolation levels define how transactions interact with one another in a database. The most common isolation levels include: 1) Read Uncommitted (allowing dirty reads, non-repeatable reads, and phantom reads); 2) Read Committed (prevents dirty reads but allows non-repeatable reads and phantom reads); 3) Repeatable Read (eliminates non-repeatable reads without preventing phantom reads); and 4) Serializable (ensures both repeatable reads and prevention of phantom reads, leading to strong consistency).

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