Prone ventilation means lying on your tummy instead of your back to help you breathe better. When some people get very sick, it can be hard to breathe because their lungs are not working well. When people lie on their back, it can be even harder to breathe because the weight of their body presses down on their lungs.
By turning onto their stomach, gravity helps the lungs expand and makes it easier to breathe. Medical staff can help you move safely onto your tummy and put a special mask or tube in your nose or mouth to give you air. This method can be really helpful for people who are really sick and need extra help breathing.
It might not be the most comfortable way to lie, but it can help you get better!