An air fryer is a kitchen appliance that cooks food by circulating hot air around it. It uses a convection mechanism to cook food evenly and create a crispy outer layer, similar to frying but with little to no oil.

Air fryers offer several benefits, including healthier cooking with less oil, faster cooking times, and the ability to cook a variety of foods. They are also easy to use and clean, making them a convenient addition to any kitchen.

Yes, you can cook frozen food in an air fryer. Many frozen foods, such as fries, chicken nuggets, and vegetables, cook quickly and evenly in an air fryer without the need for defrosting.

Some air fryers do require preheating, while others do not. It depends on the model and the specific recipe. Preheating can help ensure even cooking and optimal results. Check your air fryer's manual for preheating instructions.

Both appliances use hot air to cook food, but air fryers are typically smaller, cook faster, and often yield crispier results due to their design and air circulation pattern. Convection ovens can handle larger quantities but may not achieve the same level of crispiness.