Feature flags are switches in code that turn features on or off at runtime without a new deployment. Teams use them to release gradually, test with selected users and disable problems instantly.
Go-live is the moment a new system, product or major release is made available to real users in production. It is the culmination of planning, testing, cut-over and readiness checks.
A rollback is the act of returning a system to a previous known-good version after a release causes problems. It restores service quickly while the team investigates the cause.
A canary release ships a new version to a small share of users or servers first. The rollout widens only if error rates, latency and other health metrics stay within agreed limits.
Release management is the process of planning, scheduling, coordinating and controlling how software changes move from development into production. It keeps releases predictable, safe and well communicated.
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