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A temporary deployed version of a branch or pull request.
Preview deploys let reviewers test changes in a real browser without shipping them to production. They are common in Vercel, Netlify, and modern PR workflows.
Plainly
Think of Preview Deploy as the checklist that keeps the app open for real people. A temporary deployed version of a branch or pull request.
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.