Cognac exists because Dutch traders taught local distillers to concentrate Charente wine for the long sea voyage north — the double-distilled result turned out better than the wine itself.
Cognac is a grape brandy distilled twice in copper stills and aged for years in Limousin oak barrels, produced only around the town of Cognac in Nouvelle-Aquitaine. It's sipped neat or on ice, often after a meal.