Can you be more specific? A cra can be any number of things:
http://www.acronymfinder.com/CRA.html
In order to determine which one of those answers your question, some context would be needed.
If you have any similar questions, there is now a free interactive tool you can use to get information, available to all TurboTax users. Here is a demonstration:
http://lmgtfy.com/?q=cra
