Testing is a check of correspondence between the actual and expected behavior of programs. Quality Assurance, aka QA, which is often used, is a preventive process aimed at ensuring that all necessary techniques, procedures, standards and methodologies are followed during the product development process and provide a result without defect.

If we don’t choke at all, then it will be easier to say this: testing is one of the stages of quality assurance. At hh, our testers are quality assurance engineers, they influence the entire development process, and not just look for bugs. Later in the article, I will use the terms “tester” and “QA” as synonyms to indulge in unnecessary tediousness.