Aperol is a classic Italian amaro produced in Padua, Italy. Flavored with bitter orange, gentian, rhubarb, and cinchona, among other ingredients, it is quite a bit less bitter than Campari, the amaro to which it is frequently compared. The original recipe dates back to 1919.
Aperol is used in numerous cocktails, sometimes as a more palatable substitute to Campari in drinks like the Negroni. But it is probably best known for the Aperol Spritz, a light, refreshing cocktail made with prosecco and soda water.