What best describes the purpose of regression testing when developing software?

• A. To evaluate the software's user interface
• B. To verify that implemented changes do not disrupt existing features
• C. To check the software compatibility across devices
• D. To ensure the code adheres to security standards

Answer: (B)

The primary purpose of regression testing is to ensure that modifications made to the software—such as enhancements, bug fixes, or updates—do not adversely affect the functionality of existing features. When developers make changes, there is a risk that new code may inadvertently interfere with the already functioning parts of the software. Regression testing involves re-running previously completed tests to confirm that the existing behavior of the software remains intact and that no new defects have been introduced.

Through regression testing, teams can confidently roll out updates knowing that they have validated the core functionalities are still operating as expected. This validation is critical in maintaining software quality over time and ensuring that users experience consistent performance, despite ongoing changes and enhancements.

While evaluating the user interface, checking compatibility across devices, and ensuring adherence to security standards are all important aspects of software development and quality assurance, they serve different specific purposes that do not directly align with the core intent of regression testing.