What are Quality Defects and 03 Types of Quality Defects?

Quality control is one of the most critical steps while manufacturing a product. But a quality control inspector needs to identify the fault in the products and categorize those defects and report them. These defects are identified according to the pre-set requirements, and then the classification of defects is done.
Now the question arises as to how to categorize defects as every problem comes with unique challenges.