Quality assurance (QA) is a set of activities and procedures, also known as quality standards, that take place during and after product development while quality control (QC) focuses on monitoring results after a product is developed and produced. That means checking product development or project outcomes to meet the previously defined quality standards.

Quality Assurance vs. Quality Control: Choosing the Right Career Path | Coursera

https://www.coursera.org/articles/quality-assurance-vs-quality-control

Quality assurance vs quality control: Learn the differences, jobs, salaries, skills, qualifications, and job outlooks for both roles.