Here's the thing you need to know about Armagnac—don't ever call it Cognac.
While both fall under the category of Brandy, this distilled Wine distinguishes itself on one primary point: location.
Armagnac hails from the Armagnac region in Gascony, France, and is largely distilled using alembic continuous stills. It's higher in alcohol than Cognac, too.
Helluva selling point there.