Meaning
A pre-production environment that mirrors the live production environment for final testing and validation.
Three examples from work
Pre-release testing
QAI validated the payment webhook on staging and confirmed transactions pass.
PMGreat, then we are ready to promote the build to production.
Environment issue
DevThe staging server is throwing 500 errors after the recent database reset.
DevOpsI am applying the missing seed data now.
Demo prep
POCan we use the staging environment for tomorrow's client presentation?
LeadYes, but let's freeze deployments on staging until the call finishes.
Use 'on staging' (e.g. 'I deployed it to staging', 'Is it reproduced on staging?'). It is the final safety net before real users see changes.