What is the common alcohol base used in a Black Russian cocktail?

The Black Russian cocktail is traditionally made with vodka as its primary alcohol base. This drink combines vodka with coffee liqueur, typically Kahlúa. The choice of vodka is significant because it provides a neutral flavor that complements the rich, coffee-infused sweetness of the liqueur, allowing for a balanced and enjoyable drink. Vodka's versatility and smoothness make it an ideal base, as it doesn’t overpower the other ingredients, and it works well in the cocktail's simple yet effective two-ingredient format. The distinct pairing of vodka and coffee liqueur is what defines the Black Russian, distinguishing it from other cocktails that use different spirits.