Quality assurance is a set of activities to ensure that a website meets the specified requirements, the agreed-upon standards and procedures, and the best practices. Check your website for errors, vulnerabilities, and possible points of failure before activating your website or making it available to real users. Another common and less formal name for quality assurance is quality control testing.
Quality assurance is meant to monitor and improve the whole development process to make sure any problems are found and fixed in time. The earlier bugs are found, the cheaper it is to fix them, and the less impact they have on your business, so the huge role QA plays in web development is hard to overestimate.
While it's easy to get caught up in creative design and innovative features, website quality assurance (QA) is an important step in the design and development of a website or web application to provide a user experience. It is indispensable. (UX) What you are looking for.