A
transparency, also known in industrial settings as a "viewfoil" or "foil", is a thin sheet of
transparent flexible material, typically
cellulose acetate, onto which figures can be drawn. These are then placed on an
overhead projector for display to an audience. Many companies and small organizations use a system of projectors and transparencies in meetings and other groupings of people, though this system is being largely replaced by
video projectors and
interactive whiteboards.