Imagine a wall of post office boxes.

Everyone can look into any box they want and see what’s in there, but only the person who has the key to that individual box owns it. So no one can remove anything from the box but the owner can transfer ownership if they wish.

Now imagine that the wall of boxes is huge. There are as many boxes on the wall as there are atoms in the solar system. That’s like blockchain.

Now imagine the bitcoin blockchain is one blockchain, the ethereum blockchain is another, the dogecoin blockchain is another, and so on, and so on…

Now imagine I wanted to store some information in a single atom on a particular blockchain. Since there are so many, they are all numbered uniquely so we can all identify them.

I say to you, go look at the info on atom A1754345578886554322226679976432. You can look at it, but no one can remove the information because everyone has the ability to view the entire blockchain.

If I say “That information doesn’t exist there” A couple billion people go, “Yes it does” because they have a shared copy of that blockchain too, and since those peoples copies are the same and mine doesn’t match, they win the argument because it’s obvious I faked mine.