Distillation is a technique used to separate liquids based on their boiling points. It involves heating a liquid mixture so that the more volatile components vaporize and pass into a condenser where they condense. Simple distillation can separate two liquids with a boiling point difference of at least 70°C, while fractional distillation uses a column with multiple plates to separate very similar boiling points. Vacuum distillation uses reduced pressure to lower the boiling point of components. Steam distillation is used for heat-sensitive materials and allows distillation at lower temperatures.