An oxygen concentrator is a medical device that provides concentrated oxygen to individuals who have difficulty breathing. It works by taking in air from the environment, filtering out nitrogen, and delivering a higher concentration of oxygen to the user. This is especially helpful for patients with respiratory conditions like COPD or asthma. These devices are often used at home and are portable, making them convenient for daily activities. Unlike traditional oxygen tanks, which require refilling, oxygen concentrators can operate continuously as long as they are plugged into a power source. This ensures a steady supply of oxygen for those in need.