CPAP (Continuous Positive Airway Pressure) devices treat obstructive sleep apnea by delivering steady pressurized air through nasal, full-face, or pillow masks, preventing airway collapse during sleep. Compact bedside units with humidifiers maintain 4-20 cmH₂O pressure, ensuring unobstructed breathing and reducing snoring, daytime fatigue, and cardiovascular risks. Heated tubes prevent rainout condensation; auto-adjusting models adapt pressure breath-by-breath for comfort. Data tracking via apps monitors apnea-hypopnea index (AHI), leak rates, and usage hours, enabling remote physician adjustments. Quiet operation (<27 dB) and ramp features ease therapy initiation.