A CPAP machine is used to treat sleep apnea and other sleep-related breathing disorders by delivering a continuous, mild stream of air through a mask to keep the user's airway open during sleep. This prevents the airway from collapsing and stops breathing interruptions, leading to improved sleep quality, increased daytime alertness, and better overall health. It is a noninvasive ventilation treatment that can also help lower blood pressure and reduce the risk of cardiovascular problems associated with sleep apnea.