A microwave oven is a kitchen appliance that cooks or heats food using electromagnetic radiation in the microwave frequency range. It works by agitating water molecules in the food, which generates heat and cooks the food quickly. This method is efficient and convenient for reheating leftovers or preparing meals. Most microwave ovens have various settings for different types of food, allowing users to adjust cooking times and power levels. They often include features like timers, defrost settings, and pre-programmed cooking options. Microwave ovens are widely used in homes and restaurants for their speed and ease of use.