Liquid-liquid chromatography (LLC) is a separation technique where both phases are liquids. The stationary phase is immiscible with the mobile phase. This method is used in paper chromatography, a type of partition chromatography. In paper chromatography, the stationary phase is the chromatography paper, which interacts with the liquid mobile phase. Column chromatography uses a liquid stationary phase on a solid support, like silica gel or alumina. Thin-layer chromatography (TLC) employs a thin stationary phase layer to separate non-volatile mixtures. Gas-liquid chromatography (GLC) uses an unreactive gas as the mobile phase and a non-volatile liquid stationary phase on an inert solid support. Partition chromatography plays a crucial role in various scientific and industrial settings due to its flexibility, particularly when dealing with complex mixtures.