Cling film, also known as plastic wrap, food wrap, or Saran wrap, is a thin, transparent plastic film used to seal food items in containers, keeping them fresh. It's designed to cling to 

smooth surfaces and itself, creating a tight seal without needing adhesives. 

Main Characteristics:

Material: Originally made with PVC (polyvinyl chloride), but alternatives like LDPE (Low-Density Polyethylene) are now more common due to health and environmental concerns. 

Function: Seals food in containers to prevent spoilage and maintain freshness. 

Properties: Clings to smooth surfaces and itself, creating a tight seal. 

Thickness: Commonly around 12.7 μm (0.0005 inches) thick, but can vary.