What is the main difference between quality assurance and quality control?

The distinction between quality assurance and quality control is fundamentally rooted in their objectives and approaches. Quality assurance is primarily aimed at preventing defects before they occur by establishing processes, standards, and methodologies. It is proactive, focusing on creating reliable systems that enhance quality in the production or service delivery processes.

In contrast, quality control is a process that involves inspecting products or services after they have been produced or delivered to identify defects. It is reactive, aimed at ensuring that outputs meet the established standards through testing and inspections.

This understanding clarifies why the correct response highlights that quality assurance prevents defects through its systematic approach, while quality control involves inspecting outputs to catch any defects that may have occurred.