animal skin processed for writing or painting on
Parchment is a thin material made from animal skin. The most common use for parchment was as a material for writing on, for the pages of a book. It is different to leather in that parchment is limed but not tanned. The better qualities of parchment are named vellum.
A Sefer Torah, the traditional form of the Hebrew Bible, is a scroll of parchment.