A zapper is a type of BDSM toy that delivers an electric shock to the skin. Zappers can come in a variety of forms, such as a wand or a paddle, and are often used for sensory play or as a form of punishment. The intensity of the shock can be adjusted, making it a versatile tool for BDSM activities. Zappers should only be used by experienced BDSM practitioners who have received training on how to use them safely.