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Defect Triage is a process where each bug is prioritized based on its severity. The most important thing to understand about defect taging is that all bugs are not created equal. Some bugs are more critical than others, and you need to figure out which ones need immediate attention from your software developers. 

Triage terms are used in the software testing and quality assurance community to describe the severity of new defects.

Think of it as a way for everyone involved in the software development process - from project managers to programmers - to quickly understand how significant a particular issue is relative to other issues they're dealing with at any given moment, and then prioritize its resolution accordingly.