High-flow nasal cannula contains a lightweight tube, which then separates into two prongs; these separated prongs are placed in the nostrils of the patient, from which a mixture of air and oxygen flows. This cannula is normally attached to the patient by the tube hooking around the patient’s ears or by an elastic headband. Nasal cannula supplies oxygen in a flexible manner, which means the supply of oxygen depends upon the patient’s breathing rate and pattern.