Rock candy is a type of sugar candy that forms large, crystalline structures. It is made by dissolving sugar in water and allowing the solution to cool slowly, which encourages the sugar to crystallize. The result is a sweet treat that can be enjoyed on its own or used as a decorative element in desserts. Typically, rock candy comes in various colors and flavors, depending on the ingredients used during the crystallization process. It is often found on sticks or in small jars and is popular at fairs and candy shops. Rock candy can also be used to sweeten beverages like tea or lemonade.