Bravo, very easily explained. And I would have added that the difference between bitcoin and gold is that bitcoin is practically a wind in hands, and gold is material. And even if there is no Internet and electricity in the world or the country, then the owner of gold will feel happier and calmer.
It is true that you don't need internet and electricity to trade your gold. At the same time, even if you don't have these, then no one is going to steal your Bitcoins. Your coins will be in your wallet, and no one can take them. You just need a few KBs of bandwidth to trade them in the future.