1. What is user acceptance testing and how is it different than system testing
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2. comparison OF uat AND System testing
User Acceptance Testing
Testing performed by the actual end-users of the software product before the software is deployed to all users of the system
System Testing
Testing performed by the software team before the software is considered complete and turned over to users

3. comparison OF uat AND System testing
Attribute
System Testing
User Acceptance Testing
WHAT
Testing performed as part of SDLC to test that all components of the system work per the product specifications
Testing performed directly by a small group of actual users
WHY
To ensure that the bugs are identified and fixed before deployment to the users
To ensure that the team understands how the software will be used in the real-world (which may not be understood by the QA engineers) and make fixed if-needed
To develop training materials before the software is deployed to all users
WHO
This testing is performed by the software team, primarily by the QA engineers who could be assisted by the software engineers themselves (at least in bug fixing)
Performed directly by the end-users, generally by a small group of friendly users
WHEN
System testing is done during both types of sprints – development and release
During the final release sprint, team performs lots of tests to test the working of all the components together, i.e. ensuring the entire system as developed works well, and that all dependencies (on other systems) have been tested
Done at the end of the release sprint, when the software is considered complete by the software team, i.e. after all the System Testing has been performed
WHERE
Performed on the QA servers
Performed on the UAT servers