Caramel syrup is a sweet, viscous liquid commonly used as a flavoring and coloring agent in various culinary applications, including cocktails. It is typically made by heating sugar until it melts and caramelizes, which results in a rich, deep amber color and a complex, bittersweet taste. This syrup can add depth and a touch of sweetness to a wide range of drinks, enhancing both the flavor and visual appeal.

In the context of alcohol, caramel syrup is often used to balance the flavors in cocktails, providing a smooth, sweet undertone that can complement the harsher notes of spirits like whiskey, rum, or tequila. It is a versatile ingredient that can be used in classic cocktails such as the Old Fashioned, where it adds a subtle sweetness and enhances the overall complexity of the drink. Additionally, caramel syrup can be used to create signature cocktails, offering mixologists a tool to craft unique and memorable beverages.