High flow nasal cannula (HFNC) therapy is a method of delivering oxygen therapy to patients by providing a controlled flow of heated and humidified oxygen through nasal prongs at a higher flow rate than traditional oxygen therapy methods. HFNC has been shown to be effective in improving oxygenation, reducing work of breathing, and providing comfort to patients with respiratory insufficiency or failure. It is commonly used in settings such as intensive care units, emergency departments, and post-operative care. Research in this area focuses on optimizing the use of HFNC, exploring its effectiveness compared to other oxygen therapy methods, and determining the appropriate patient populations for its use.