BiPAP, or bilevel positive airway pressure, is a type of noninvasive ventilation that helps with breathing. It is commonly used to treat medical conditions that impair breathing, such as chronic obstructive pulmonary disorder (COPD), obstructive sleep apnea, and pneumonia. BiPAP machines deliver pressurized air into the airways through a mask or nasal plugs, which helps to open the lungs and improve breathing. Unlike continuous positive airway pressure (CPAP) machines, which deliver the same amount of pressure as you breathe in and out, BiPAP machines deliver higher air pressure when you breathe in and lower pressure when you breathe out. BiPAP may not be a good option if your breathing is very poor. It is important not to eat or drink anything while using BiPAP, as you may inhale food or liquid into your lungs.