Distillation is a method of separating chemical substances based on differences in their volatilities in a boiling liquid mixture.
Commercially, distillation has a number of uses.
It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating.
Air is distilled to separate its components - notably oxygen, nitrogen and argon - for industrial use.
Distillation of fermented solutions has been used since ancient times to produce distilled beverages with a higher alcohol content.
Water is distilled to remove impurities, such as salt from sea water.