What is the question to: "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."? The topic is Polyethylene terephthalate.
The answer is: what is Polyester in packaging PET?