Oxygen delivery devices are tools used to provide supplemental oxygen to individuals who have difficulty breathing or low oxygen levels in their blood. Common types include nasal cannulas, which are small tubes placed in the nostrils, and oxygen masks, which cover the nose and mouth. These devices help increase the amount of oxygen a person receives, improving their overall respiratory function. In medical settings, ventilators may also be used for patients who cannot breathe on their own. These machines deliver oxygen directly into the lungs through a tube inserted into the airway. Proper use of oxygen delivery devices is essential for effective treatment and patient safety.