The Vibe: When a blockchain splits into two different paths because of a big code change or disagreement.
The Details: A fork happens when developers update the blockchain’s rules (protocol). There are two types: “soft forks” (minor upgrades everyone can agree on, backward-compatible like a software patch) and “hard forks” (major changes that split the chain into two—one old, one new—not compatible, creating a whole new coin). Famous examples: Bitcoin Cash forked from Bitcoin over block size fights; Ethereum Classic split from Ethereum after a hack debate. Holders often get free coins from the new chain (1:1 with what you owned).
Pro Tip: Forks can be exciting (free coins!) but risky—do nothing if your coins are safe in a wallet; exchanges might credit new ones. Always update software carefully and DYOR which chain wins community support long-term.