Set txn status-capturing system and business errors

Hi Guys,I need help with capturing business and system exceptions in REFramework.
How do we acheive this. Any help on this regards will be much appreciated.

Thanks

@Rani1978

To capture BusinessesRule Exception then use Throw activity and mention below.

            New BusinessRuleException("Exception Message")

hi I dont understand the diff between -
1)

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what do i do if i have to capture any system exception in my workflow.
what do i do when i have to capture any business exception in my workflow
what is throw do…what if you do not want to use throw and capture the actual business or system exception and not my customized error message using throw