A ventilator is a medical device that helps patients breathe when they are unable to do so on their own. It delivers oxygen to the lungs and removes carbon dioxide, ensuring that the body receives the necessary air for survival. Ventilators are commonly used in hospitals for patients with severe respiratory issues, such as those caused by COVID-19, pneumonia, or chronic obstructive pulmonary disease (COPD). These machines can be adjusted to control the amount of air and oxygen delivered, as well as the pressure and timing of breaths. Ventilators can be invasive, using a tube inserted into the windpipe, or non-invasive, using a mask. They play a crucial role in critical care settings, supporting patients until they can breathe independently again.