Wine preservation refers to methods used to maintain the quality and flavor of opened bottles of wine. Once a bottle is opened, exposure to air can lead to oxidation, which alters the taste. Common preservation techniques include using vacuum pumps to remove air, argon gas to displace oxygen, and specialized wine stoppers that create a seal. Another effective method is refrigeration, which slows down the oxidation process. For long-term storage, keeping wine in a cool, dark place with stable temperatures is essential. Proper preservation helps ensure that wine remains enjoyable for a longer period after opening.