Think of a blockchain like a notebook, but a very special notebook.

Let’s say we’re all part of a classroom group where we share a notebook. Every time someone buys or sells something, such as swapping lunch or borrowing a pen, they write it down in the notebook, so everyone knows what happened.

Now here’s the twist:

- Nobody is allowed to erase or change what was written once it's there.

- Everyone has a copy of the notebook, and they all update it together.

So if I write, “Shamza gave Grant a sandwich at 1:00 PM,” that note gets copied into everyone’s notebook. If someone tries to say later, “No, Grant gave Shamza the sandwich,” they can’t change it unless everyone agrees, which is really hard to do unless it’s the truth.

This notebook, where every page is linked to the last one and can’t be changed without everyone noticing, is what we call a blockchain.

Now let’s break the word down:

- Block: A page in the notebook, full of transactions.

- Chain: The pages are linked together, like a chain. Once you add a page (a block), you can't take it out without breaking the whole chain, and everyone will notice.

Why is this useful?

It’s great for things like money (Bitcoin), digital ownership (NFTs), or even voting, because:

- It’s secure; hard to cheat.

- It’s transparent; everyone can see the history.

- It’s shared; no single person controls it.

So blockchain is like a shared notebook where we write down digital events, and once they’re written, they’re permanent and trusted, even though no one person is “in charge” of the notebook.

#blockchain