Ethereum Classic is original ETH that has been renamed to ETC after the split on block 1920000 which was done to return the stolen funds from the DAO organization on the now ETH network. ETC believes this was a mistake as it muddies the “hands off, the code is law” approach. The Ethereum Classic mission statement is:"We believe in decentralized, censorship-resistant, permissionless blockchains. We believe in the original vision of Ethereum as a world computer you can't shut down, running irreversible smart contracts. We believe in a strong separation of concerns, where system forks are only possible in order to correct actual platform bugs, not to bail out failed contracts and special interests. We believe in a censorship-resistant platform that can be actually trusted - by anyone."