Ethereum Classic (ETC) is a platform and a token that was generated as a result of a hard fork on the Ethereum network. A decision caused the fork following a successful hacking event, where one digital organization called The DAO lost 1/3 of their 11.5 million ETH tokens.
One month after the hack, The Ethereum Foundation decided that it was going to implement changes that will return the stolen ETH to the original investors. Part of the community protested, supporting the ideology that "Code is law," and thus Ethereum Classic was born.
Ethereum Classic is the original Ethereum that never changed, mainly due to ideological and psychological reasons. All in all, this is an excellent example of the value and power of ideas and decisions, which in this case resulted in a brand new cryptocurrency.
Official Website: https://ethereumclassic.github.io