Hi! Thank you for your question. The main difference between CPAP and BiPAP machines lies in how they deliver air pressure. A CPAP (Continuous Positive Airway Pressure) machine provides one constant, steady pressure to keep the airway open during both inhalation and exhalation. It’s the most common treatment for obstructive sleep apnea (OSA) and is typically recommended as the first-line therapy for mild to moderate cases. A BiPAP (Bilevel Positive Airway Pressure) machine, on the other hand, delivers two different pressure levels—one for inhaling (higher) and one for exhaling (lower). This can make it more comfortable for some people, especially those who have trouble exhaling against continuous pressure or have more complex breathing issues like central sleep apnea or COPD. The decision between CPAP and BiPAP is usually based on the results of a sleep study, which helps determine the severity and type of sleep apnea and which pressure settings would be most effective for your needs.