Staging
In plain terms
A pre-production environment mirroring production for testing.
Going deeper
Staging closely replicates production so changes can be validated under realistic conditions before going live. It's the last checkpoint before release.
Under the hood
Catches environment-specific bugs CI can miss; value depends on how faithfully it mirrors production.
Examples
Pre-release testing, QA validation, deploy verification, prod-like environments.
Think of it like...
Like a dress rehearsal on the real stage before opening night.