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Regression testing is a testing practice that verifies existing functionality remains intact after changes are made to an application. As software systems grow and evolve, even minor updates can introduce unexpected side effects, making regression testing essential for maintaining stability.

By consistently applying regression testing, teams can validate critical workflows, integrations, and shared components after every change. This is especially important in agile and continuous delivery environments, where frequent deployments increase the risk of unintended breakages.

Automated regression testing enables fast and repeatable validation, while targeted manual regression checks add confidence in complex or high-risk areas. Together, they help teams balance speed with reliability.

When embedded into development and release pipelines, regression testing supports predictable releases, reduces production defects, and builds long-term confidence in software quality.