How does a blockchain work - Simply Explained

What is a blockchain and how do they work? I'll explain why blockchains are so special in simple and plain English in this video. Watch the full video and you will understand the Blockchain working principle and when it was introduced.
A blockchain is a diary that is almost impossible to forge.
What is Blockchain, How does it work and why it was needed to watch this video to the end and you will understand it as the video is very simple to tell you about Blockchain technology?