What distinguishes a Dirty Martini from a regular Martini?

A Dirty Martini is distinguished from a regular Martini primarily by the addition of olive brine, which introduces a savory, salty flavor to the cocktail. This modification enhances the drink's complexity and makes it appealing to those who enjoy a more flavorful profile than what is generally offered by a traditional Martini, which is typically made with in and vermouth. The brine is usually added in varying quantities depending on personal preference, resulting in a drink that is not only different in taste but can also vary in how "dirty" it ultimately becomes.

Other variations in the options, such as using whiskey instead of gin, a dash of bitters, or adding a cherry garnish, do not define a Dirty Martini. The traditional Martini is predominantly gin-based, and whiskey would classify it as a different type of drink entirely, such as a Manhattan. Bitters can be a component in some variations of cocktails but are not a characteristic of either Martini version. A cherry garnish is more commonly associated with drinks like a Manhattan or an Old Fashioned, adding yet another layer of distinction.