This document provides information about different types of columns used in high performance liquid chromatography (HPLC). It discusses normal phase and reverse phase chromatography columns. It describes various column packing materials, particle sizes, dimensions, costs and specifications. It provides details on columns from several major manufacturers like Waters, Phenomenex, Agilent, GE Healthcare and others. Preparative chromatography is also briefly mentioned. Resources for further information are listed at the end.