Blockchain - What's that ??

Its likely that years ago, someone told us about the Internet and we answered "huh?". That was my first reaction to understanding The Blockchain.

Blockchain technology is being developed and, of course, relies on the Internet

Here's Wikipedia's explanation

A blockchain facilitates secure online transactions.[30] A blockchain is a decentralized and distributed digital ledger that is used to record transactions across many computers so that the record cannot be altered retroactively without the alteration of all subsequent blocks and the collusion of the network.[31][1] This allows the participants to verify and audit transactions inexpensively.[32]