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.
The definition of done is a shared checklist of conditions every piece of work must meet before a team calls it complete. It makes "finished" mean the same thing for everyone.
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 QA engineer makes sure software works as intended before and after release, designing test strategies, writing automated tests and finding defects. QA means quality assurance, and teams often hire one when escaped bugs start reaching customers.
Quality assurance (QA) is the set of practices that make sure software meets requirements and works reliably for users. It covers how quality is built into the process as well as how products are tested before release.
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