Elderflower liqueur is a sweet, floral alcoholic beverage made from the blossoms of the elderflower plant, typically Sambucus nigra. It is often produced by infusing the flowers in a base of alcohol, sugar, and water, resulting in a light, fragrant drink that is popular in cocktails and as a standalone aperitif. This liqueur is commonly used in various cocktails, such as the Hugo and Elderflower Collins, and can also be enjoyed with sparkling water or champagne. Its unique flavor profile adds a refreshing touch to drinks, making it a favorite during warm weather and festive occasions.