Oxygen masks are fundamental in delivering concentrated oxygen to patients. They come in various types, including simple masks, venturi masks, and non-rebreather masks. The choice of mask depends on the patient’s condition and the level of oxygen required. For instance, a non-rebreather mask provides a high concentration of oxygen, making it suitable for critical patients. Ensuring a snug fit is crucial, as leaks can result in inadequate oxygen delivery. Proper cleaning and maintenance of masks are equally important to prevent infections.