The Blockchain explained for a 5 year old!

Alright! Imagine you have a magic notebook. Every time you and your friends trade toys, you write down who gave which toy to whom. Everyone has a copy of this notebook, and every page in it has a special seal so you can't just erase or change what's written. This way, everyone can trust that the trades are fair. The notebook is like a blockchain, and each page is like a block of trades. Cool, right?