The process of reverting a system, database, or application to a previous stable state after a failed update or deployment. It's a critical safety mechanism in change management.
From 'roll' (Old French 'roler') and 'back' (Old English 'bæc'). The computing term emerged in database systems in the 1970s and expanded to general software deployment in the 1990s.
Rollback is like having a time machine for your software - when things go wrong, you can literally go back to when everything worked. The best deployment systems can rollback in seconds, which is why Netflix can push code hundreds of times per day without fear!
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