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A group of database changes that must succeed or fail together.
Transactions protect important flows like payments, inventory, and account updates. If one step fails, the database rolls back the whole group instead of leaving half-written data.
Plainly
Think of Transaction as a labeled box where an app keeps important things. A group of database changes that must succeed or fail together.
In practice
Use it when a feature reads, writes, migrates, validates, or audits stored information. In practice, define the owner, input, output, and failure mode before you rely on it.