The term 'champagne descriptor' refers to the three main categories of champagne, which are based on the sweetness level of the beverage. The first category is 'PALE, ' which has a low sugar content and is the driest of the three. The second category is 'SEC, ' which has a medium sugar content and is slightly sweeter than PALE. The third category is 'BRUT, ' which has a high sugar content and is the sweetest of the three.