A splint can be anything that prevents movement of a limb. A splint is used to prevent further damage and limit pain. To be effective, a splint must immobilize the joints above and below the injury.
Splints can be made from readily available objects, such as a magazine or stack of newspapers. But splints usually consist of a rigid, straight object, such as a board, strapped to the limb. A sling may be used with a splint to support the forearm when an arm, a wrist, or a collarbone is injured.