i've been hearing a lot about something called Ethereum these days .
if you know any informations about Ethereum please comment it so i can know more about it .
and is it true that he threatens the existance of bitcoin ?
Ethereum is a threat in the sense that it could overtake bitcoin in the first position regarding market cap, but it is not like bitcoin is going to disappear the day that happens or anything so don't worry to much about it, in the other hand I think that is one of the reasons the devs are trying to approve segwit as soon as possible.