What testing is (and what it is not)

Software testing is the process of executing a program or system with the intent of finding defects and gathering information about its quality and risk. Notice what that definition does NOT say: it does not say we are trying to prove the software works correctly. That distinction matters enormously. Testing can show that defects are present, but it can never prove that a product is completely free of bugs. No matter how many tests you run, there is always a scenario you have not covered. A passing test suite tells the team 'we did not find a defect with these inputs under these conditions' — not 'there are no defects'. Testing is also not the same as debugging. When a tester finds that a feature behaves incorrectly, their job is to document and report the defect — not to fix the underlying code. Debugging is the developer's work: locating the root cause and correcting it. Testers and developers play complementary roles. Finally, QA is decision-support, not a safety certificate. The QA team provides information that helps managers and stakeholders decide whether to release, delay, or fix. Saying 'QA approved this release' does not mean zero defects will reach users — it means the team has enough confidence, given the risks they found, to ship.