A deep fryer is a kitchen appliance used for cooking food by submerging it in hot oil. This method allows for even cooking and creates a crispy texture on the outside while keeping the inside moist. Deep fryers come in various sizes and can be used for frying a wide range of foods, including potatoes, chicken, and doughnuts. Most deep fryers have a temperature control feature, which helps maintain the oil at the right heat for optimal frying. Some models also include a basket for easy food handling and a lid to reduce splatter. Proper safety measures should be taken when using a deep fryer to prevent burns or fires.