A process in which new changings are made, or the previous rules are modified to improve the friendliness of a blockchain for the users is called Blockchain Forking. Blockchain Forking could result in the formation of two separate blockchains or the chain remain same with a few updates or innovations.

A successful strong fork, the new chain with the updated nodes is extended faster and the outdated ones are decoupled, leaving the old chain to die or continue to support it.

Yes, this is done in the case of the Hard Fork. When there is a disagreement between the developers and the nodes of a blockchain, this results in the occurrence of a Hard Fork, creation of two chains from the same parent chain.

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