The primary function of a user acceptance testing (UAT) process is to validate that a software application meets the needs of its end-users before final deployment. This testing phase allows actual users to test the system against requirements and expectations. Feedback from UAT helps identify any issues or enhancements needed, ensuring the software is intuitive and effective. Successful UAT leads to higher user satisfaction and reduces post-launch errors, ultimately contributing to a smoother transition and integration within the organization.