QA vs Software Testing: Why the Two Terms Are Not Interchangeable

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Quality Assurance (QA) and software testing are related but distinct disciplines in software development. QA is process-oriented, focusing on preventing defects by improving how software is built from the start, while testing is product-oriented, verifying that the software actually works as expected. A software tester performs structured tasks such as designing test cases, executing them, reporting defects, and retesting fixes — not merely clicking around looking for bugs. The two functions complement each other, with QA beginning early in development and testing occurring throughout the lifecycle. Understanding this distinction highlights that QA carries a broader responsibility: helping teams build better software, not just catching errors after the fact.

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