This document discusses high performance liquid chromatography (HPLC). It begins by defining HPLC and explaining that it uses high pressure to forcibly pump the mobile phase, allowing for high performance and speed separations of mixtures into individual components. The document then discusses the basic components of an HPLC system including the solvent reservoir, pump, injector, column, detectors, and recorder. It explains the functions of these components and provides examples. It also discusses different types of HPLC including normal phase, reverse phase, size exclusion, and ion exchange. The document provides several examples and applications of HPLC.