Tetrahydrothiophene (THT) is primarily used as an odorant in natural gas and propane to ensure leak detection. Its strong, distinctive smell helps in identifying gas leaks quickly, enhancing safety in residential, commercial, and industrial settings. Additionally, THT serves as a solvent in various chemical processes and is utilized in the synthesis of pharmaceuticals and agrochemicals. Its role as an intermediate in organic synthesis further extends its application in producing other sulfur-containing compounds.