Used as a biocide in industrial water treatment systems to control microbial growth, particularly in cooling towers and paper mill systems. It effectively targets bacteria, fungi, and algae, helping prevent biofouling and system degradation. Also employed as a chemical intermediate in the synthesis of certain pesticides and pharmaceuticals. Its reactivity makes it useful in organic synthesis for introducing thiocyanate groups. Handle with care due to its toxicity and potential for releasing hydrogen cyanide under acidic conditions.