System testing is one of the types of black-box testing that is focused on performance of the whole system with your software installed on it. QA expert has to make sure your application not only functions well by itself but also doesn't change/break anything in the system. This is usually the last stem in the whole software development process. You've got the product delivered, and then you need to do black-box testing to ensure your application doesn't cause any inconsistencies and output any errors.
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