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 an altcoin which is one of the rivals of bitcoin. Compared to bitcoin, ethereum has a lower value. Just like bitcoin, it is used in different transactions in the internet. Also, it is used by application developers to pay transactions fees and services in ethereum network. So, ethereum is a cryptocurrency just like bitcoin but has a lower value but some miners work to earn this and not bitcoin.
A lot of people compare the 2 but I don't think they are really direct competitors. Bitcoin is the king of cryptocurrencies and ethereum is the king of smartcontracts, app based development and ICOs.