As software systems are updated and new bugs are created, previously functioning features may stop working as intended.
In the software testing process, quality assurance (QA) and quality control (QC) are closely related and complement each other to ensure product quality. QA prevents defects through process improvements, while QC ensures that bugs are detected and fixed in the final product.
Manual testing is a type of software testing that involves testers executing test cases step-by-step, observing results firsthand, without relying on scripts or automated tools.