Fortified Wine
While often treated as a type of dessert wine, but it's so vast that it deserves a category on it's own. They can either be dry or sweet, but because of the deep complexity to their profile, as well as the weight of the alcohol & body, it's usually treated as a post dinner drink. Made by adding grape brandy to a wine, fortified wines can often be barrel aged for years, and tend to have a much longer shelf life once opened due to the higher alcohol content. Read up more here!