What is the purpose of pvc skin on some wallpapers?

PVC skin on wallpapers serves as a protective layer that enhances durability and moisture resistance. This makes the wallpaper easier to clean and more suitable for high-humidity areas, such as kitchens and bathrooms. Additionally, the PVC layer can improve the wallpaper's overall aesthetic appeal, providing a smooth finish and a variety of design options. Overall, it helps extend the lifespan of the wallpaper while maintaining its visual quality.