Editing Transparency (projection) (section)

{{Short description|Plastic sheet for an overhead projector}}
{{More citations needed|date=December 2009}}
[[Image:OHP-sch.JPG|thumb|right|300px|Overhead projector in operation, with a transparency being flashed]]
A '''transparency''', also known variously as a '''viewfoil''' or '''foil''' (from the French word "feuille" or sheet), or '''viewgraph''', is a thin sheet of [[transparency (optics)|transparent]] flexible material, typically [[polyester]] (historically [[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 projector]]s and [[interactive whiteboard]]s.