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UAT stands for User Acceptance Testing.
It is the final phase of testing before software goes live. In this stage, real users test the system to make sure it meets business requirements.
QA testing checks:
Whether the code works correctly

UAT checks:
Whether the software actually solves the user’s real problem

UAT is usually performed by:
End users

Business analysts

Product owners

Clients

If UAT fails, the product should not go to production.
In simple terms:
QA ensures technical quality.
UAT ensures business approval.