Liqueur is an alcoholic beverage that has been flavored with fruit, herbs, nuts, spices, flowers, or cream and bottled with added sugar. Liqueurs are typically quite sweet, they are usually not long, but at the age of rest periods during their production have so flavors to marry.
The distinction between liqueurs and spirits is not simple because many spirits are available today in a flavored form (eg, vodka). The most reliable guide to classification is that liqueurs contain added sugar, but not spirits.
Some people distinguish between liqueur, but the words are synonyms. Dessert wines may taste like a liqueur, but they contain no added flavoring or sugar.
Most liqueurs have included a lower alcohol content (15% -30% ABV) than spirits, but some liqueurs as much as 55% ABV.