Dehydration methods are techniques used to remove moisture from food, extending its shelf life and preserving nutrients. Common methods include air drying, where food is exposed to warm air; sun drying, which utilizes sunlight; and freeze drying, where food is frozen and then subjected to a vacuum to remove moisture. Another popular method is using a dehydrator, an electric appliance designed to circulate warm air around food. Each method has its advantages and is suitable for different types of food, such as fruits, vegetables, and meats, allowing for versatile preservation options.