Column chromatography, a cornerstone in chemical analysis, finds extensive applications in separation and purification processes. Introduced in 1900 by chemist D.T. Day, this technique employs a stationary phase—commonly silica gel or alumina—and a mobile phase to elute components based on their affinities. The principle involves the differential adsorption of sample components onto the stationary phase, creating distinct separation patterns. Types include normal- and reversed-phase chromatography, with applications spanning pharmaceuticals, biochemistry, and forensic science. Factors affecting performance include stationary phase, particle size, and mobile phase composition. Method optimization involves adjusting parameters such as flow rate, temperature, and detection methods. Applications range from drug purification and natural product isolation to forensic drug analysis. The versatility and adaptability of column chromatography make it an indispensable tool across scientific disciplines.