Cetyltrimethylammonium bromide, used in hair conditioners, is classified as a

Its surface-active part is the quaternary ammonium cation $[\mathrm{C}{}_{16}\mathrm{H}{}_{33}\mathrm{N}(\mathrm{CH}{}_3){}_3]{}^{+}$ with a long hydrocarbon tail, with bromide as counter-ion. A detergent whose active part is a cation is cationic.