This category includes carbonated mixers such as club soda, tonic water, ginger beer, and cola that provide effervescence, dilution, and complementary flavor to spirits. Carbonation lifts aromas, lightens the body of a drink, and creates a refreshing quality that makes cocktails like the Moscow Mule or Gin & Tonic so iconic. Each soda brings its own flavor profile, from the bitter quinine of tonic to the spicy warmth of ginger beer.