A CPAP machine, or Continuous Positive Airway Pressure machine, is a medical 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, reduce daytime fatigue, and lower the risk of related health issues such as heart disease. It is often recommended by healthcare providers for individuals diagnosed with obstructive sleep apnea, helping them achieve better overall health and well-being.