An oxygen concentrator is a medical device used to provide supplemental oxygen to individuals who have difficulty breathing. Chronic Obstructive Pulmonary Disease (COPD): This is a lung disease that makes it difficult for affected individuals to breathe properly. Oxygen therapy is a common treatment option for COPD patients, and an oxygen concentrator can be used to deliver the necessary oxygen. Oxygen concentrators work by extracting oxygen from the surrounding air and filtering out nitrogen and other gases, leaving behind a concentrated stream of oxygen that can be delivered to the patient. They are typically small and portable, making them easy to use at home, in the hospital, or while traveling.