A wine stopper is a device used to seal an open bottle of wine, preventing air from entering and helping to preserve the wine's flavor and aroma. These stoppers come in various materials, including cork, silicone, and metal, and are designed to fit snugly in the bottle's neck. Using a wine stopper can extend the life of an opened bottle, allowing you to enjoy the wine over several days. Some stoppers even feature vacuum mechanisms to remove air, further enhancing preservation. Proper use of a wine stopper can help maintain the quality of your favorite wine for longer periods.