A UAT checklist is a comprehensive checklist of all items that need to be tested as part of the user acceptance testing (UAT) process. The checklist should include manual and automated tests and be tailored to the application or system being tested. The purpose of the UAT checklist is to ensure that all aspects of the system are tested thoroughly and that no critical functionality is missed. The checklist can also help identify any potential defects or issues that may need to be addressed before the system goes into production.