A splint is a device used to immobilize and support a body part, typically an injured limb, to allow for healing. Splints are typically made of hard or semi-rigid materials, such as metal, plastic, or cardboard, and are used to keep a body part in a stable position to reduce pain, swelling, and prevent further injury. Splints can be used for a variety of injuries, such as fractures, sprains, and dislocations. They are commonly used in emergency situations to stabilize an injury before more permanent treatment, such as a cast, can be applied.