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Regression testing involves systematically retesting software to ensure that changes, such as enhancements and bug fixes, have not adversely affected existing functionality. This process is critical in maintaining the overall quality of the software product, especially in large systems where numerous modifications can introduce new defects or cause regressions in previously tested features. Regression testing techniques include re-running test cases, using automated testing tools to expedite the process, and implementing test automation frameworks that support continuous integration and delivery pipelines. This subcategory fits into the broader hierarchy of Software Defect Tracking by providing a methodical approach for ensuring that software modifications do not inadvertently introduce new defects or regressions, ultimately contributing to improved product quality and customer satisfaction.