BiPAP machines are a type of positive airway pressure (PAP) therapy device used to treat sleep apnea and other respiratory conditions. They work by delivering two different levels of air pressure: one for inhaling and one for exhaling. This can help to keep your airway open during sleep, preventing apneas (episodes when you stop breathing) and hypopneas (episodes of shallow breathing).
There are a few different types of BiPAP machines available, but the most common are bilevel positive airway pressure (BiPAP) machines and automatic bilevel positive airway pressure (Auto-BiPAP) machines. BiPAP machines have two fixed pressures, while Auto-BiPAP machines can adjust the pressure levels automatically based on your breathing needs.