What type of glass is traditionally used for serving a martini?

The type of glass traditionally used for serving a martini is the martini glass. This glass is characterized by its distinctive cone shape, which not only adds to the aesthetic appeal but also serves a functional purpose by helping to maintain the drink's temperature. The wide bowl allows for easy mixing and garnishing, while the narrow stem ensures that the drinker can hold the glass without warming the cocktail with their hand. The design of the martini glass elevates the drinking experience by highlighting the purity and clarity of the martini, making it a classic choice for this iconic cocktail. In contrast, other glass types mentioned, like Collins, highball, and rocks glasses, serve different types of cocktails with varying ingredients and presentation styles.