Plain English
A fork is a rule change to a blockchain. A soft fork is backward-compatible — old nodes still validate new blocks, just with fewer features. A hard fork is not — every node must upgrade, or the chain splits. Bitcoin Cash was a hard fork of Bitcoin. Ethereum Classic was a hard fork of Ethereum.
How it actually works
Soft forks tighten rules (any new transaction must satisfy stricter requirements). Hard forks change or relax them. When a hard fork is contentious — meaning a significant minority refuses to upgrade — two parallel chains can persist permanently. Both inherit the pre-fork history, but every block after the split is different.
What it means for you
Forks can create new coins for existing holders (if you held BTC at the moment of the BCH fork, you got BCH 1:1). They can also break wallets, smart contracts, and bridge assumptions. Major coordinated forks (Ethereum’s Merge, Bitcoin’s Taproot) are well-tested. Unplanned or contentious forks are operational events you have to manage like a corporate action.
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Educational content only. Not investment, tax, or legal advice.