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 or in healthcare settings and can be powered by electricity or batteries. Unlike traditional oxygen tanks, which need to be refilled, an oxygen concentrator can produce a continuous supply of oxygen, making it a convenient option for long-term use.