Shrink-wrap is a clear thermoplastic film wrapped loosely around a product and then heated so it shrinks tightly to the product’s shape, forming a sealed, tamper-evident package. The film, usually PVC, polyolefin, or polyethylene, contracts as the heat sets it, clinging to every contour. It groups multi-packs, protects books and food trays, and seals pallet loads for transport. For food, it offers visibility with protection, though it is not a barrier to oxygen unless combined with other films. The verb follows the noun: to shrink-wrap goods is to enclose them this way. Recycling is problematic, since the thin films tangle machinery, which is pushing industry toward mono-material alternatives.