In fact, vodka is officially defined more along the lines of what it isn't, than what it is. Our own government classifies it as "any neutral spirits distilled or treated after distillation with charcoal or other materials so as to be without distinctive character, aroma, taste or color." Any flavored vodka is the result flavoring added after the distilling process.
Today, some of the most popular brands of commercially available vodka include Grey Goose, Absolut, Smirnoff, Ketel One, and Ciroc -- with many American imports coming from the so-called "Vodka Belt," a region of Eastern Europe including Norway, Sweden, Finland, Russia, Poland, and Ukraine. That's the birthplace of vodka, and where most of it is still produced.
And some iconic cocktails that traditionally use vodka include the Moscow Mule, the Bloody Mary, the White Russian, and the vodka martini.