Ethereum Classic (ETC) is a hard fork of Ethereum (ETH) that launched in July 2016. Its main function is as a smart contract network, with the ability to host and support decentralized applications (DApps). Its native token is ETC.
Since its launch, Ethereum Classic has sought to differentiate itself from Ethereum, with the two networks’ technical roadmap diverging further and further from each other with time.
Ethereum Classic first set out to preserve the integrity of the existing Ethereum blockchain after a major hacking event led to the theft of 3.6 million ETH.
Actually Ethereum classic is original old one. Ethereum did hardfork and they decide to call new one Ethereum and old one Ethereum classic.
ROBINHOODLAB
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@actork, The Ethereum network forked after an incident in July 2016. At that time, attackers exploited flaws in the smart contract code of a prominent application running on Ethereum called The DAO. In response to community concerns, the Ethereum Foundation implemented a hard fork to roll back all DAO-related transactions and allow the DAO's original contributors to reclaim their funds.
While many in the community supported the Ethereum hard fork, some chose to continue running the original Ethereum blockchain. That blockchain eventually became known as Ethereum Classic.