A plaster bandage is a type of medical dressing used to support and protect injured or broken bones. It is made from a gauze-like material that is impregnated with plaster of Paris, which hardens when it comes into contact with water. The plaster bandage is then wrapped around the affected area to provide support and protection. The term 'CAST' is often used to refer to a plaster bandage, as it is used to create a CAST-like structure around the affected area.