An oxygen concentrator is a medical device that provides concentrated oxygen to individuals who have difficulty breathing. It works by filtering and compressing the air in the environment, removing nitrogen and other gases to deliver a higher concentration of oxygen. This is especially useful for patients with respiratory conditions such as 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 continuously produces oxygen, making it a more convenient and cost-effective solution for long-term oxygen therapy.