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Hard Fork is a term for events that occur when a cryptocurrency developer team agrees to apply new features / changes to the programming coin system. Usually this is done to secure a cryptocurrency network or adapt to the increasing number of coin users. Hard Fork can cause incompatibility between the old version and the new version, so that all cryptocurrency users need to update all applications related to this coin so they can continue to translate properly.
This is usually done to secure the cryptocurrency network so that it can adapt to the growing number of coin users. But the problem is, hard fork can cause incompatibility between the old version and the new version so the user must continue to update the application so that they can continue to transact.
The history of Hard Fork starts from setting up the crypto system itself which cannot validate a new block validly. That way, the existence of this hard fork is intended to balance the differences in nodes that have been used previously with new nodes.