Hi @proto
Difference between Throw and ReThrow :-
1) Throw :- Throw activity is used when you want to throw error before the execution of the step.
2) Rethrow :- Rethrow is used when you want activities to occur before the exception is thrown.
Have a look through below thread :-
That is the best eg for Throw Activity
Happy Automation 
Best Regards
Er Pratik Wavhal 

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