What is a common use for a corkscrew in bartending?

A corkscrew is primarily used in bartending to open wine bottles, making it an essential tool for any bartender. When dealing with wine, it is important to extract the cork efficiently to preserve the wine's integrity and flavor. This process not only allows the bartender to pour the wine into glasses for serving but also facilitates the aeration of the wine itself, enhancing its aromas and taste. The design of a corkscrew, whether it’s a simple spiral or a more advanced lever-type tool, is specifically engineered for easy and effective cork removal, which is crucial in a busy bar setting. This targeted functionality aligns directly with the common practice in bartending that involves serving wine, thereby underscoring why wine bottle opening is its most common use.