The Coravin is a fairly new device that allows you to extract wine from a sealed (with cork) bottle. When using it, the device inserts a needle through the foil and through the cork. The wine is then extracted through that needle and into your glass. Coravin uses a small amount of Argon gas under low pressure to push the wine from the bottle and in to your glass. Since the cork reseals and Argon gas is inert and weighs more than air, it keeps the oxygen from connecting with the liquid. Therefore, the wine stays fresh.