An orthopedic cast is a protective shell made from materials like plaster or fiberglass, used to immobilize broken bones or injured joints. It helps keep the affected area stable, allowing for proper healing. Casts are commonly applied to limbs, such as arms and legs, and come in various shapes and sizes. The process of applying a cast involves wrapping the injured area with padding, followed by the cast material. Once it hardens, the cast provides support and prevents movement. Patients typically wear a cast for several weeks, depending on the severity of the injury, and must follow care instructions to ensure effective healing.