Ammonium tetrachloroaurate(III) hydrate is widely used in the preparation of gold nanoparticles and thin films, which are essential in various advanced technologies. It serves as a precursor in the synthesis of gold-based catalysts, which are crucial in chemical reactions such as oxidation and hydrogenation processes. This compound is also employed in the electronics industry for gold plating and coating applications, ensuring high conductivity and corrosion resistance in components. Additionally, it is utilized in the production of specialized glass and ceramics, where gold imparts unique optical properties. In the field of medicine, it plays a role in the development of gold-based therapeutic agents and diagnostic tools.