While looking analysis results, you could find that (for example) a Kiuwan rule is generally helpful and must be kept active. But, in some concrete cases, it is not applicable (or it is not properly working) and some defects should not be considered in the analysis.
Reasons to “silence” (or mute) those defects can be of very different nature but you might decide that, the rule should not be applied in certain particular cases o situations.
In any case, you want to keep active the rule but discard some specific defects. Kiuwan provides the Mute Defect functionality to do it.
Please, also have a look at How to manage Kiuwan defects when I do not completely agree with them