A Manual Resuscitator, also known as a bag-valve-mask (BVM) or Ambu bag, is a handheld medical device used to provide positive pressure ventilation to individuals who are experiencing respiratory distress or failure. It consists of a self-expanding bag, a unidirectional valve, and a face mask. Medical professionals use the manual resuscitator by squeezing the bag, delivering a controlled amount of air or oxygen to the patient's lungs. This emergency ventilation method is crucial in situations where immediate and temporary respiratory support is needed, such as during cardiac arrest, trauma, or when a patient is unable to breathe adequately on their own. Manual resuscitators are a critical component of basic life support and pre-hospital care.