Web and app development Quality Assurance (QA) is a vital process that ensures software products meet high standards before release. It involves systematic testing to identify and address defects in functionality, usability, security, and performance. QA begins early in development, with testers collaborating closely with developers to establish testing requirements and criteria. Various types of testing, including functional, usability, compatibility, performance, and security testing, are conducted using manual and automated methods. Detailed test reports track defects and testing results, guiding iterative bug-fixing cycles to deliver high-quality software that meets user expectations. Ultimately, QA minimizes risks, enhances product quality, and fosters trust with users.