It is a sibling from a ship such as Etherium (ETH) and Etherium Classic (ETC). The breakup of these two currencies is due to a major hacking in 2016. As a kind of artificial intelligent autonomous server 'DAO,' which controls the trading and operation of Etherium, has been hacked, 3.6 million Etherium, which is 10% of the total, has been stolen.
The Etherium Foundation, which developed the Etherium Network, was able to restore the Etherium to its pre-stolen condition. However, on July 24, 2016, the Etheric chain, which was stolen from Polonics, a large-scale virtual currency exchange, was listed under the name "Etherium Classic (ETC)" and actual transactions began to take place.
So, to restore the hacking, it is etherium that returns the block to the previous state and creates the new block chain, and the original block chain containing the stolen etherium is considered as Etherium Classic.
The trading volume of the Etherium Classic has once again surpassed Etherium, and is now steadily on top in the top five virtual currencies. In the official sense, Etherium is not the Etherium Classic, but the money that is causing the thunderstorm this year with etherium. According to the World Coin Index, a virtual currency index site, Etherium is the No. 1 trading volume and Etherium Classic is No. 4 on June 13 at 2:00 pm.