What is the purpose of using a wine preserver like argon and how does it help in preserving the quality of the wine?

The purpose of using a wine preserver like argon is to prevent oxygen from coming into contact with the wine. Oxygen can cause wine to oxidize, leading to a loss of flavor and aroma. By using argon, which is an inert gas, the wine is protected from oxidation, helping to preserve its quality and freshness for a longer period of time.