There is a common stereotype that software testing is just a dull exercise in checking what should already work. In reality, the cost of a missed bug in a serious product is far higher than a minor visual glitch or a button shifting out of place. It can lead to failures in critical workflows, data loss, service outages, and major financial damage for the business.
People often say that QA is just there to check developers’ work. That is a superficial view. The role of QA is not simply to confirm that the code works, but to try to uncover every scenario in which it can fail. QA engineers have to think differently from the people who built the system. They need to think like real users, including those who will inevitably follow unexpected paths or use the product in ways no one originally planned.