A CPAP machine, or Continuous Positive Airway Pressure machine, is a device used to treat sleep apnea, a condition where a person's breathing repeatedly stops and starts during sleep. The machine works by delivering a steady stream of air through a mask that keeps the airway open, allowing for uninterrupted breathing throughout the night. Using a CPAP machine can improve sleep quality and reduce daytime fatigue for those with sleep apnea. It is often recommended by healthcare professionals and can significantly enhance overall health by lowering the risk of complications associated with untreated sleep apnea, such as heart disease and high blood pressure.