A still is an apparatus used to distill liquid mixtures by heating to selectively boil and then cooling to condense the vapor.
These unwanted and flavor-changing sulfur compounds are chemically removed from the final product resulting in a smoother, better-tasting drink.
The simplest standard distillation apparatus is commonly known as a pot still, consisting of a single heated chamber and a vessel to collect purified alcohol.
A pot still incorporates only one condensation, whereas other types of distillation equipment have multiple stages which result in higher purification of the more volatile component (alcohol).
Reflux stills incorporate a fractionating column, commonly created by filling copper vessels with glass beads to maximize available surface area.