A cocktail napkin is a small napkin usually made of paper but may be linen for more formal events. It is used to prevent drips from a glass and make holding a cold drink more pleasant so the condensation from the glass does not make our hands wet. The napkins should be served with a cocktail and also be available for guests on or near the bar area.
A cocktail party tip: Hold the drink in your left hand to keep your right hand dry and free to shake hands with other guests.