A mechanical ventilator is a medical device that helps patients breathe when they are unable to do so on their own. It delivers a controlled flow of air and oxygen into the lungs, ensuring that the body receives the necessary oxygen and removes carbon dioxide. This device is commonly used in hospitals for patients with respiratory failure or during surgery. Mechanical ventilators can be adjusted to provide different levels of support based on the patient's needs. They can operate in various modes, allowing for both full support and partial assistance. This flexibility makes them essential tools in critical care settings, such as intensive care units (ICUs).