A wine bottle closure is a device used to seal a wine bottle, preventing air from entering and preserving the wine's quality. The most common types of closures include cork, screw cap, and synthetic cork. Each type has its advantages, such as the traditional cork allowing for some oxygen exchange, which can enhance aging, while screw caps provide a tighter seal. The choice of closure can affect the wine's flavor and longevity. Corks are often preferred for premium wines, while screw caps are gaining popularity for their convenience and reliability. Understanding these options helps consumers make informed choices when selecting wine.