Used as a source of iodine in animal feed to prevent iodine deficiency. Employed in photography and in the preparation of certain photographic emulsions. Serves as a catalyst or reagent in organic synthesis, particularly in iodination reactions. Utilized in cloud seeding operations to promote rainfall. Applied in some medical and pharmaceutical formulations where a soluble iodide source is needed. Also used in the food industry as a nutritional supplement in salt and other fortified products.