Why hardware RAID controllers when talking about mdadm?

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Hi,
   OK, so I'm confused. This is very, very basic stuff I think. The
first line of Neil's page

http://neil.brown.name/blog/mdadm

says "mdadm is a tool for managing Linux Software RAID arrays" which
is the way I've used it, but I'm just a casual home user. However
there are  and number of threads here where pros far more
knowledgeable than I point people toward possibly purchasing hardware
RAID controllers.

   Is this about something like creating a nested RAID using two or
more underlying hardware RAIDs instead of just individual drives? Or
is there something else going on here?

Thanks,
Mark
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