Cetyl Trimethyl Ammonium Bromide (CTAB) is a quaternary ammonium compound commonly used as a surfactant and emulsifier in various personal care products, such as shampoos and conditioners. It helps to reduce surface tension, allowing for better mixing of oil and water, which enhances the product's effectiveness in cleansing and conditioning hair. In addition to its use in cosmetics, CTAB is also employed in laboratory settings as a reagent and in the preparation of nanoparticles. Its antimicrobial properties make it useful in formulations aimed at preserving products and preventing microbial growth.