It's not just one network or one blockchain ... Polkadot is this whole universe of up to a hundred connected blockchain networks. So, they're all kind of plugging into this core, to the network, and through that, they get, kid of out-of-the-box, the ability to communicate with any other network that's connected to Polkadot.

If Elon Musk is right that we are living in a simulation, there would be nothing funnier than watching everybody who's in a simulation develop their own simulation to then put themselves in inside the simulation that you created for them.

Polkadot, on its own, is nothing without these blockchains that it's connecting, and we call these blockchains 'parachains'.