Companies and countries that wants transparency in their financial transaction and discharge of other duties are fast adapting blockchain technology because of the fact that it cannot be edited.
Blockchain simply put is a system created to store information and data in a way that It cannot be hacked and traced. You can check the link below it might help you understand better.
A blockchain is a digitally distributed, decentralized, public ledger that exists across a network. It is most noteworthy in its use with cryptocurrencies and NFTs.
It is really a complicated process that I still don't understand it fully from the blockchain ledger to cryptography and so many other things. I suggest you check it out on Google to have advanced explanation from expert
Blockchain does not store any of its information in a central location, the blockchain is copied and spread across a network of computers. Whenever a new block is added to the blockchain, every computer on the network updates its blockchain to reflect the change.