The purpose of using quality assurance (QA) in software development is to ensure that the final product meets specified requirements and is free of defects. QA processes involve systematic testing, code reviews, and adherence to standards throughout the development lifecycle. By implementing QA, teams can identify and rectify issues early, improving software reliability and reducing costs associated with post-release fixes. Ultimately, a robust QA practice enhances user satisfaction by delivering high-quality, functional software that meets user expectations.