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Regression testing is a preventive maintenance technique focused on retesting previously verified functionality after changes such as enhancements, patches, or configuration modifications have been made to ensure that they haven't unintentionally caused defects or regressions in the software. It involves executing test cases that cover prior functionality and comparing the results with previous outcomes. By performing regression testing under preventive maintenance, organizations can proactively identify and fix issues early in the software development lifecycle, thereby minimizing potential risks and ensuring software reliability and stability over time.