Polyethylene (PE) films, including low density (LDPE), linear low density (LLDPE), and high density (HDPE), have become the base material for flexible packaging due to their excellent chemical resistance, moisture resistance, and cost-effectiveness. PE film is lightweight and durable, and is widely used in food packaging (such as bread bags and shrink film), industrial liners, agricultural land films, and medical protective covers. Its flexibility and heat-sealing properties enable it to be seamlessly integrated into multilayer composite films or stand-alone applications, while additives enhance its UV resistance, anti-fog or puncture resistance. PE films meet global food contact and safety standards, achieving a balance in performance, price, and environmental innovation, driving progress in circular economy practices.