A microwave oven is a kitchen appliance that cooks food using electromagnetic radiation in the microwave frequency range. It heats food quickly by causing water molecules in the food to vibrate, producing heat. This method allows for faster cooking compared to conventional ovens. Microwave ovens are commonly used for reheating leftovers, defrosting frozen food, and cooking a variety of dishes. They come in different sizes and power levels, making them suitable for various kitchen spaces and cooking needs. Many models also include features like timers and preset cooking options for added convenience.