I can try to give you an analogy. Let's take cargo ships for instance.

I hope this analogy helps making these computing paradigms less abstract. There are many approximations and concepts that I had to stretch to makes them work with the analogy and are not really exact but that should give a rough idea of the differences, and how these affect the distributed computers that implement them.

And if the cargo doesn't fit, it's just thrown in the sea.
Either way they keep the money.