Relevancy, Appropriateness, Detail, Currency, Authority,Bias

What's it used for?

Radcab is an acronym and you use to see if a website is truthful and trustworthy. It is also an easy and simple way to do so.

Why is that useful?

You would want to use this because if you are doing research for school you want a trustworthy website and if its not trustworthy then that's not good. Lets say the author was just making this as a joke and you read it and you used the information and it was false information.