This document provides an overview of surfactant classification and applications. It defines surfactants as substances that lower surface tension and interfacial energies when present at low concentrations. Surfactants are classified as ionic (cationic, anionic, amphoteric) or non-ionic. Their special molecular structure allows them to solubilize insoluble substances. Common applications of surfactants include home care products, personal care products, health care products, industrial and institutional cleaning, crop care, and industrial uses. Surfactants are widely used due to their ability to mobilize and mix substances that do not normally combine.