Air fryers are kitchen appliances that cook food by circulating hot air around it. They work by using a mechanical fan to circulate the hot air at high speed, cooking the food and producing a crispy layer similar to frying, but with much less oil. Air fryers are often used to cook foods that are traditionally fried, such as french fries, chicken wings, and mozzarella sticks. They are also used to bake foods like cookies and muffins. Air fryers are popular for their ability to produce crispy, flavorful food with a fraction of the oil used in traditional frying, making them a healthier alternative for those looking to reduce their fat intake.