Polyethylene oxide (PEO) is a synthetic polymer made from the polymerization of ethylene oxide. It is a white, waxy solid that is soluble in water and various organic solvents. PEO is commonly used in a variety of applications, including pharmaceuticals, where it serves as a thickening agent, and in the production of hydrogels for drug delivery systems. In addition to its use in medicine, PEO is also found in personal care products, adhesives, and coatings. Its unique properties, such as high molecular weight and biocompatibility, make it valuable in both industrial and research settings.