Sloe gin is a type of liqueur made by infusing gin with sloe berries, which are small, dark purple fruits from the blackthorn bush. This infusion process results in a deep red, slightly sweet, and tart beverage with a lower alcohol content compared to traditional gin.

In the context of cocktails, sloe gin is a versatile ingredient that adds a unique fruity and slightly sour flavor. It is commonly used in classic cocktails like the Sloe Gin Fizz, where it is mixed with lemon juice, simple syrup, and soda water to create a refreshing and effervescent drink. Sloe gin can also be used in a variety of other cocktails to introduce a rich berry flavor and a touch of sweetness. Its distinctive taste makes it a popular choice for both traditional and contemporary mixed drinks.