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Regression testing is a type of software testing that seeks to uncover new software bugs, or regressions, in existing functional and non-functional areas of a system after changes have been made to them. This could include modifications to the code, infrastructure, or even documentation. The goal is to ensure that previously developed and tested software still performs correctly under the modified conditions. It involves retesting existing functionality after each modification to verify that it has not been adversely affected. This type of testing is crucial in ensuring the overall quality and reliability of a system as it evolves, especially for systems where changes are frequent and have the potential to introduce unintended consequences. By identifying and addressing these regressions early on, teams can maintain the integrity and stability of their software while also improving efficiency by reducing the time and resources required to address issues later in the development cycle.