With actual deep-frying, your food is directly immersed in hot oil. The oil completely surrounds every inch of the food, so it gets uniformly crispy. With ordinary baking, your food gets less crispy, because baking cooks by surrounding your food with hot air and air is not as good a conductor of heat as oil.
Uses a fan to circulate heat just like a convection ovenIdeal for cooking for one or two people, as food will tend cook faster than a convection oven due to compact sizeIf cooking for more people, you will likely need to cook food in batches, meaning more time in the kitchen than if you cooked the same meal in a convection oven