Ethylene glycol is the simplest aliphatic diol, typically appearing as a colorless, transparent, viscous liquid with a sweet taste and hygroscopic properties. It is primarily used in the production of polyethylene terephthalate (the raw material for polyester fibers and plastics), as well as in the synthesis of pharmaceuticals, pesticides, resins, surfactants, softening agents, and explosives. Additionally, it serves as a reagent, antifreeze, desiccant, and heat transfer medium for convective cooling in applications such as automotive systems and liquid-cooled computers.