Final answer:
A CPAP device is a treatment option for sleep apnea that involves the use of a mask and a pump to deliver pressurized air and keep the airway open during sleep.
Step-by-step explanation:
A continuous positive airway pressure (CPAP) device is a treatment option for sleep apnea. It includes a mask that fits over the sleeper's nose and mouth, and is connected to a pump that delivers pressurized air into the airways. This helps keep the airway open and allows for normal ventilation during sleep. CPAP devices are effective for mild to severe cases of sleep apnea, but alternative options are being explored due to compliance issues.