An Apéritif is an Alcoholic beverage usually served before a meal to stimulate the appetite, and is therefore usually dry rather than sweet. Common choices for an Apéritif are Vermouth; Champagne, Pastis, Gin, Rakı and any still, dry, light white wine.
There is no single alcoholic drink that is always served as an Apéritif. Fortified wine, Liqueur, and dry Champagne are probably the most common choices. Because it is served before dining, the emphasis is usually on dry rather than sweet, as a general guideline.
In Italy, Vermouth or Wine may be served as the Apéritif, called Aperitivo.