A Mouth-to-Mouth Resuscitation Mask, also known as a CPR mask or pocket mask, is a medical device designed to provide a barrier between the rescuer and the person in need of cardiopulmonary resuscitation (CPR). These masks are used during CPR to protect both the rescuer and the victim by preventing direct contact and the exchange of bodily fluids. They are commonly used in first aid and emergency situations, especially when administering rescue breaths to someone who is not breathing or experiencing cardiac arrest.