Blockchain technology was born in response to concerns of some parties to the workings of a centralized software.
This technology was born in 2009 along with the advent of Bitcoin virtual currency which is becoming the current trend.
Blockchain technology is a technology that underlies the running of Bitcoin without relying on centralized servers and thus avoids the risk of downtime.
The blockchain system comes by transforming a centralized approach into decentralization.
In principle, blockchain technology conditions every server that runs this software to form a network consensus automatically to mutually replicate transaction data and verify each other's data.
Therefore, when one server is hacked, the server can be ignored because it is considered to have data that is different from the majority of other server networks.
This makes blockchain technology a much more powerful attack than a centralized technology because there is always at least 1 server running to handle transactions.
Blockchain technology enables network consensus to record and validate every transaction so that incoming data can not be falsified, lost or corrupted so that it can not be manipulated by the network provider.
The analogy to how blockchain works is almost the same as a cash book in a bank that records all transactions done by its users.
The only difference is that only authorized parties can access the transactions information in the bank's cash book, while transactions through blockchain can be viewed by all users because the information collected is also distributed to everyone who runs the server.
Additionally, since server access is granted to everyone, no party can fake or modify the transaction.