Simple syrup is a liquid sweetener made by dissolving sugar in water. It has no added flavorings or additives, and it's commonly used as an ingredient in cocktails, coffee drinks, tea beverages, and other recipes that call for a sweetener. The ratio of sugar to water is usually 1:1, but you can adjust the amount of sugar depending on how strong you want the syrup to be. Simple syrup is easy to make at home and keeps well in the refrigerator for several weeks.