Diethylene glycol is widely used as a solvent in the production of resins, plasticizers, and adhesives, offering excellent solubility for various substances. It serves as a key component in antifreeze and coolant formulations, helping to lower the freezing point and raise the boiling point of liquids in automotive and industrial systems. In the textile industry, it acts as a softening agent and humectant, enhancing the texture and moisture retention of fabrics. Additionally, it is utilized in the manufacture of unsaturated polyester resins, which are essential for creating fiberglass-reinforced plastics. Its hygroscopic properties make it suitable for use in air conditioning systems to control humidity. In the pharmaceutical and cosmetic industries, it functions as a stabilizer and viscosity modifier in various formulations. However, its use in food and oral products is strictly regulated due to potential toxicity concerns.