Original: Polyethylene terephthalate ( sometimes written poly ( ethylene terephthalate ) ) , commonly abbreviated PET , PETE , or the obsolete PETP or PET-P ) , is a thermoplastic polymer resin of the polyester family and is used in synthetic fibers ; beverage , food and other liquid containers ; thermoforming applications ; and engineering resins often in combination with glass fiber .
Simplified: It is used in synthetic fibers ; beverage , food and other liquid containers ; thermoforming applications ; and engineering resins often in combination with glass fiber .