Wallpaper is a decorative material used to cover and decorate the interior walls of homes, offices, and other buildings. It is usually sold in rolls and is applied onto a wall using wallpaper paste. Wallpaper can be made from many materials such as paper, vinyl, fabric, and even natural materials like grasscloth and cork. It is available in a wide variety of colors, patterns, and textures, and can be used to create a unique look in any room. Wallpaper can also be used to hide imperfections in walls, and can be easily removed and replaced when desired.