Bitcoin is a payment instrument and I explain as we send a letter quickly and immediately. Inside the letter there is some money. With this explanation children can understand easier. Simplify everything about technology, let your imagination fly away. It is good for the coming generation to know about Bitcoin because they are the ones going to experience the fully revolution of it. Bitcoin can be taught as the first cryptocurrency or virtual currency to be founded and it operates on a decentralized model where holders or parties involved in its transaction are given the power or control over their own transactions without the interference of any central authoritative body. It offers classic security, speed and low transaction cost as compared to the fiat.
You only just to explain that btc is different than dollar or any other currency in the world. Maybe children do not and cannot really understand in their age. And maybe they still do not have to understand. But it is okay to teach them about btc and crypto by now to them. And I think, in my opinion, I will give you some little advice to explain it to them. Btc does not have a physical form, at last not for now. Unlike any other normal currency in each country around the world, they have physical form. And the price of btc always going up, unlike the price of any other normal currency in each country around the world. So I think those are good information for children.