A hard fork (Blockchain) refers to the changes to the protocols of the blockchain that leads to the separation of the main blockchain network. Like other systems, blockchain also requires updates to reduce vulnerabilities and to add improved, new features. But before moving forward with any update, the nodes have to come to a consensus. It is mandatory that the developers upgrade to the latest version of the protocol software.
Hard Fork is usually commenced by developers or members of the crypto community. They might be facing issues with the transactions, and blocks and don’t like the functionalities offered by the previous version of blockchain. They want to make some necessary changes so that the blockchain would function at its best.