Regression testing ensures that existing functionality continues to work after new code changes are introduced. In environments where releases happen often, even small updates can unintentionally affect stable features.

By running regression testing regularly, teams can identify issues early and prevent defects from reaching production. It helps validate that bug fixes, enhancements, and refactoring do not create side effects in other parts of the system.

Regression testing is commonly automated to support continuous integration, but manual checks are still useful for complex workflows and edge cases. Together, these approaches help teams maintain quality without slowing down delivery.

Understanding why regression testing matters enables teams to manage change more confidently and sustain software reliability as applications evolve.