Distillation is a process used to separate liquids by heating and then condensing the vapor back into a liquid. This is done using a distillation apparatus, which consists of a container for the liquid, a heat source, and a condenser coil. When the liquid is heated, it vaporizes and rises through the condenser coil, where it condenses and becomes a liquid again. Distillation is used in a variety of contexts, including chemical processes, alcohol production, and laboratory experiments.