Parchment paper is a type of paper made from specially treated calfskin, sheepskin, or goatskin. It is often used for important documents, such as diplomas, certificates, and legal papers. VELLUM is a type of parchment paper that is made from calfskin and is usually thicker and more durable than other types of parchment paper. It is often used for illuminated manuscripts, maps, and other works of art.