Distillation it is used for separating liquids that boil at different temperatures

Distillation is the process of vaporizing a substance and then collecting it in another beaker after condensing it. When the mixture is heated, the component with the lowest boiling point starts vaporizing first and exits from the fractionating column.

So, it is used for separating liquids that boil at different temperatures and contain non-volatile impurities. For example- the purification of alcohol.