Blockchain is a type of shared database that differs from a typical database in the way that it stores information
blockchains store data in blocks that are then linked together via cryptography.
Once the block is filled with data, it is chained onto the previous block, which makes the data chained together in chronological order.
Different types of information can be stored on a blockchain, but the most common use so far has been as a ledger for transactions
In Bitcoin’s case, blockchain is used in a decentralized way so that no single person or group has control.
The goal of blockchain is to allow digital information to be recorded and distributed, but not edited.
What a blockchain does is to allow the data held in that database to be spread out among several network nodes at various locations.
Because of the decentralized nature of Bitcoin’s blockchain, all transactions can be transparently viewed by either having a personal node or using blockchain explorers that allow anyone to see transactions occurring live
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