An air fryer can be a standalone countertop appliance or part of an oven, countertop oven or range. An air fryer oven delivers crispy results quickly with the use of little to no oil. Similar to a convection oven, a fan circulates hot air rapidly around food in a perforated tray or basket. Because all the surface areas of the food are exposed to hot air, the food cooks to become crispy on all sides without having to be immersed in hot oil.