There's a fuck load of science involved in allowing you to get shithoused at the bar on Friday night. Despite this, people have been creating alcoholic drinks since damn near the dawn of time. Fermentation was one of the first chemical reactions mankind figured out how to control. That puts making booze in the same class as making fire. This is some fucking fundamental stuff.
The difference between the method for making wine and the method for making whisky is essentially the same as the difference between baking and frying. There is, however, a sort of hybrid between the two that you've probably heard of.
What the Fuck is Brandy?

To understand what brandy is you need to understand the difference between fermentation and distillation. Fermentation is simple: yeast interacts with sugar to produce ethanol, which gets you drunk. Many popular alcohols are made in this way, including beer (fermented starches ranging from barley to rice), wine (fermented grapes), and mead (fermented honey). Distillation is the process by which you concentrate alcohol and other good bits from a fermented mixture. This is how you get rum (distilled sugar), whisky (distilled starches), and tequila (distilled blue agave). Basically, fermentation makes it alcoholic while distilling makes it super alcoholic.
So, finally answering the fucking question: Brandy is distilled wine. Basically, it's like whisky made with grapes. It tastes very earthy and smokey, like a good scotch, but with an undeniable sweetness. It isn't for the amateur drinker, no matter what Young Jeezy would have you believe.