An air fryer is a kitchen appliance that uses hot air circulation to cook food. It works by circulating hot air around the food at high speeds, which helps to cook it quickly and evenly. The result is food that has a crispy exterior similar to deep-fried food, but with much less oil or fat. Air fryers are popular for cooking foods like french fries, chicken wings, and other fried foods, as well as for reheating leftovers. They are often marketed as a healthier alternative to traditional deep frying because they use significantly less oil, and can be a convenient and easy way to cook meals at home.