Ethereum Classic, or ETC, is like a sibling of Ethereum with a focus on sticking to its original principles. It came to be after a big disagreement in the community leading to a split. Ethereum Classic keeps the original Ethereum blockchain going, just as it was before the split, emphasising unchangeable transactions and a classic take on blockchain philosophy. It's for those who believe in the original vision of Ethereum as an unchanged, tamper-proof record of transactions. Think of it as a history book that can never be rewritten, keeping everything exactly as it happened.