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Regression Testing in the context of Debugging refers to the process of re-testing software after modifications have been made, with the aim of ensuring that previously resolved issues do not reoccur. It plays a crucial role in maintaining the quality and reliability of software, particularly during the debugging phase when multiple iterations of fixing and testing are taking place. Regression Testing builds upon the foundation laid by Software Testing and Regression Testing, ensuring that all aspects of these stages are thoroughly evaluated to identify any unintended consequences resulting from code changes. This process involves running a series of pre-existing test cases to validate the functionality of both new and modified software components. By doing so, it helps to pinpoint and isolate any regressions or unexpected behavior caused by updates or fixes, ultimately leading to more stable and robust software. In summary, Regression Testing in the Debugging context serves as a safety net for software developers, providing them with the assurance that their modifications have not introduced new issues while resolving existing ones. It is an integral part of maintaining software quality throughout the development lifecycle.