Hexadecyl trimethyl ammonium bromide (CTAB) is widely used as a cationic surfactant in various applications. In molecular biology, it is a key component in the extraction and isolation of DNA from plant and bacterial cells, as it helps break down cell membranes and separate DNA from proteins. CTAB is also employed in the synthesis of nanoparticles, particularly gold and silver nanoparticles, where it acts as a stabilizing agent to control particle size and shape. In the cosmetic industry, it is used in hair conditioners and skincare products for its emulsifying and antistatic properties. Additionally, CTAB finds applications in the petroleum industry as a corrosion inhibitor and in the textile industry as a fabric softener. Its antimicrobial properties make it useful in disinfectants and sanitizers.