QA testing (Quality Assurance testing) is a type of software testing that focuses on ensuring that a software product or application meets the established quality standards and requirements. It involves a series of activities, techniques, and methodologies that are designed to prevent defects, identify and address quality issues, and optimize the quality of the software product or application. The goal of QA testing is to identify and resolve quality issues before the software product or application is released to the end-users or customers, and to ensure that the software meets the expectations of its users in terms of functionality, performance, security, and usability.