It measures the quality of processes used to create a quality product. It is a system of management activities, It is a preventive process, It applies for entire life cycle & Deals with Process.

Quality Assurance (QA) is a proactive, preventive process that focuses on improving the development processes themselves to ensure quality. It applies to the entire software life cycle and involves management activities, process standards, and methodologies. Quality Control is reactive product testing, Verification checks against specifications, and Validation checks against user needs.