An oxygen concentrator delivers purified oxygen to your face through two open prongs below your nostrils via a thin tube from the apparatus. To increase oxygen concentration and flow, some people wear facemasks as well.
In order to provide patients with pure oxygen to breathe, oxygen concentrators draw air from the environment, filter out undesirable gases, concentrate oxygen, and then blow it via a pipe. The benefit in this case is that, unlike oxygen tanks, concentrators are portable and operational around-the-clock.
An oxygen tank, which provides liquid or gaseous oxygen, is not the same as an oxygen concentrator. The concentrator, on the other hand, is a device that draws in the air around you and removes the nitrogen.