what is the relation between metacard and revolution?

[James Z]

I'm really confused.

Can someone tell me what the relation between Metacard and Revolution is? I
understand that they are compatible and there seems to be some connection
between the two.

Which is better or are they the same? How did the compatibility between them
come about.

Lastly, why is the Metacard mailing list hosted by Revolution?

Thanks

James Zuchelli