Why do people keep Sambuca in the refrigerator?

People keep Sambuca in the refrigerator to enhance its flavor and serve it chilled, which can make the anise and herbal notes more refreshing. Chilling also helps to mellow the sweetness, making it more enjoyable to sip after a meal or in cocktails. Additionally, serving Sambuca cold can bring out its aromatic qualities, making for a more pleasant drinking experience.