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.
Post-launch support is the work of keeping software running, secure and improving after release. It covers bug fixes, monitoring, updates, user help and small enhancements.
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.
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.
User acceptance testing (UAT) is the final phase of testing, in which business users or clients check that software meets their needs in realistic scenarios. It comes before the software is approved for release.
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.
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