What is the 'dark figure of crime'? Why is it important?

Question

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The Answer is Responses could include:
-The amount of crime that is undetected, not reported and not recorded.
-In order to measure crime and understand its impact on individuals, it needs to be reported and recorded.
-Without such information, it is difficult to obtain information for policy and procedure development.
-Data is also important for determining and allocating resources.
-The information gained from surveys about the dark figure of crime allows some identification of the crimes that go unreported and why.
-Crimes like domestic violence and sexual assault are significantly underreported suggesting that informal and formal responses to these crimes may be inadequate.

What Is the 'Dark Figure of Crime'? Why Is It