A fizz is another family of cocktails, the defining features of the fizz are an acidic juice, such as lemon or lime juice, and carbonated water (and some argue champagne as well). Some say it's a variation on the older "sours" family. There are a couple alcohols common to a fizz, gin, whiskey, and rum. The typical glass for a fizz is a highball glass or a delmonico glass with a 8 to 10 ounce capacity.
The best known fizz cocktails: Gin Fizz, Sloe Gin Fizz, Ramos Gin Fizz, Whiskey Fizz, Manhattan Cooler, Chicago Fizz, Buck's Fizz, Mimosa