A liqueur is an alcoholic drink flavored variously by fruits, herbs, spices, flowers, nuts or cream combined with distilled spirits. Often served with or after dessert, they are typically heavily sweetened and un-aged beyond a resting period during production, when necessary, for their flavors to mingle. Liqueurs generally contain a lower alcohol content (15–30% ABV) than spirits and it has sweetener mixed, while some can have an ABV as high as 55%.Some liqueurs are prepared by infusing certain woods, fruits, or flowers in either water or alcohol and adding sugar or other items. Others are distilled from aromatic or flavoring agents. Liqueurs are historical descendants of herbal medicines. They were made in Italy as early as the 13th century, often prepared by monks, (as in Chartreuse). Today they are produced the world over, commonly served straight, over ice, with coffee, in cocktails, and used in cooking.
Cocktails : Liqueurs are sometimes mixed into cocktails to provide flavor.
Layered drinks : Layered drinks are made by floating different-colored liqueurs in separate layers. Each liqueur is poured slowly into a glass over the back of a spoon or down a glass rod, so that the liquids of different densities remain unmixed, creating a striped effect.