Wallpaper is a kind of material used to cover and decorate the interior walls of
homes, offices, and other buildings; it is one aspect of interior decoration. It
is usually sold in rolls and is put onto a wall using wallpaper paste. Wallpapers
can come plain as "lining paper" (so that it can be painted or used to help cover
uneven surfaces and minor wall defects thus giving a better surface), textured ,
with a regular repeating pattern design, or, much less commonly today, with a single
non-repeating large design carried over a set of sheets.