Whiskey Sour Mix is a key ingredient in the creation of various cocktails, most notably the classic Whiskey Sour. This mix typically consists of lemon juice, simple syrup, and sometimes egg white, which together provide a balance of tartness and sweetness that complements the strong, bold flavors of whiskey.

When used in cocktails, sour mix (a type of pre-made cocktail mix) simplifies the process of making a Whiskey Sour by combining the necessary elements in one convenient product. This allows both professional bartenders and home enthusiasts to create a consistently flavorful drink without needing to measure and mix individual components. The result is a refreshing and tangy cocktail that highlights the character of the whiskey while offering a pleasant, balanced taste experience.