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A production-like environment used to test changes before they go live.
Staging catches integration problems that local development can miss. It should resemble production enough that test results mean something.
Plainly
Think of Staging as the checklist that keeps the app open for real people. A production-like environment used to test changes before they go live.
In practice
Use it when a change has to survive deploys, users, incidents, analytics, or billing reality. In practice, define the owner, input, output, and failure mode before you rely on it.