Introduction to sparkling wines. Sparkling wines might be one of the most misunderstood of all wine categories. Bubbly, frothy, sometimes pink and sweet, they are often written off as frivolous. Sparkling wines today comprise the fastest-growing segment of the U.S. wine market. While there are luxury brands there are plenty of options at a reasonable price too. No need to wait for a celebration to enjoy a bottle of bubbly!