Bitcoin Hard Fork
A fork occurs when enacting a new set of rules. A hard fork is a permanent change/divergence in the blockchainA blockchain is a shared digital ledger, or a continually up... More protocol and is not backwards compatible. This means that nodes that haven’t upgraded can’t validate blocks that have been created by upgraded nodes which follow newer consensusConsensus is a mechanism, usually used by most nodes on the ... More rules.
A good example of a BitcoinThe term "Bitcoin" can either refer to Bitcoin the network, ... More hard fork is the one that took place between bitcoin (BTC) and bitcoin cash (BCH), due to the recommended different approaches to scale and process more transactions.