Sodium thiosulfate has several uses, for instance, it is used in the photography industry as a fixative. In addition to this, this substance can also be used as a reducing agent, water purifying agent and as a nitrogen exhaust neutraliser.
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Sodium thiosulfate, used for a wide range of applications, is a crystal-like substance. It has medical uses that include an anti-fungal treatment and to counteract the effects of cyanide poisoning. It is also utilized in photographic processes, and many more applications. You can find more information here: http://www.mayoclinic.com/health/drug-information/DR601263