A nasal cannula is a medical device used for delivering supplemental oxygen to patients who require oxygen therapy. It consists of a lightweight tube with two prongs that are inserted into the nostrils, allowing oxygen to flow directly into the patient's nasal passages. Nasal cannulas are commonly used in hospitals, clinics, and homes for patients with respiratory conditions such as chronic obstructive pulmonary disease (COPD), pneumonia, or heart failure. They are preferred over other oxygen delivery methods for their comfort, ease of use, and ability to provide a consistent flow of oxygen. Research in this area focuses on improving the design, effectiveness, and patient experience of nasal cannulas to optimize oxygen therapy outcomes.