A distilled alcohol derived from wine, such as Spanish or Armenian brandy, or fermented fruit juice, such as many other spirits called after the delicious base fruit that are produced/found all over the world, such as Williamine, Abricotine, and many others, is referred to as brandy.
Conversely, cognac, like champagne and sparkling wine, is exclusive to the Cognac area of France.
Because of its flavor, which is developed through aging in wooden casks, brandy is a popular digestif. It is usually consumed neat from a sniffer glass. You can explore further if you like what you see here.