A ventilator works to help a person breathe by blowing air into the patients airway through a breathing tube.
On the Ventilator one end of the ventilator tube is inserted into the patient's windpipe and the other end is attached to the ventilator.
The breathing tube of the ventilator machine serves as an airway by letting air and oxygen from the ventilator flows into the lungs.
The ventilator basically acts like an air pump by forcing air that we normally breathe into the persons lungs to help them breathe.
Normally we breathe this same air and oxygen in without any problems but when someone has issues with breathing they need a ventilator.
Being on a ventilator is never a good thing but not everyone on a ventilator will die or be severely ill.
Ventilators are also used sometimes during surgery so that the person can breathe.