A dirty martini is a popular cocktail made by mixing gin or vodka with dry vermouth and olive brine. The addition of olive brine gives the drink its distinctive salty flavor, which is why it is referred to as "dirty." It is typically garnished with olives, enhancing its savory profile. This cocktail is often served chilled in a martini glass, which has a wide bowl and a long stem. The dirty martini can be customized by adjusting the amount of olive brine to suit individual taste preferences, making it a versatile choice for cocktail enthusiasts.