Vellum is an extra fine version of parchment, a thin, paper-like material made from hides of goats, sheep and calves. Historically it has been used to write, draw and paint upon, as well as to bind books. For many years before computer aided design and digital printing became so widely available, designers and architects drew construction documents on vellum, which were then used to run blueprints. Vellum is still a popular art and stationery medium.
See also: parchment