A "cast" refers to a group of actors who perform in a play, movie, or television show. Each member of the cast plays a specific role, contributing to the overall story. The cast can vary in size, from a few actors in a small production to hundreds in a large film. In another context, a "cast" can also mean a hard protective covering used to support broken bones while they heal. This type of cast is usually made from plaster or fiberglass and is applied by a medical professional. It helps immobilize the injured area to promote proper healing.