Testing is a systematic process used to evaluate whether a product, feature, or system meets the expected requirements, functions correctly, and delivers a consistent user experience across all scenarios. It involves identifying defects, validating business logic, verifying usability, and ensuring stability under different environments and conditions. A strong testing approach combines manual exploration with structured test cases, automated scripts, and continuous review of edge cases to uncover issues that may not be visible during regular usage. Effective testing also includes regression checks to confirm that new updates do not break existing functionality. Beyond functionality, testers must consider performance, security, compatibility, and real-world user behavior to ensure the final product is reliable, scalable, and ready for production. The ultimate goal of testing is not just to find bugs but to improve quality, reduce risk, and deliver a smooth and trustworthy experience for end users.