Blockchain Forking is a process in which modifications or changings are made in the rules and protocols of a blockchain. If there is a complete disagreement between developers or the stakeholders of a chain, this could be result in the formation in a new blockchain, Hard Forking.

To increase the present block size on a blockchain, developers need to do forking.

Yes, you are very true here that the forking could be done to improve the scalability of a blockchain. By increasing the block size, the capacity of a block to occupy more transactions is increased and hence more transaction can be stored within a second (high scalability).

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