A microwave is a kitchen appliance that uses electromagnetic waves to heat and cook food. It works by agitating water molecules in the food, causing them to vibrate and generate heat. This method allows for quick cooking and reheating, making it a popular choice for many households. Microwaves come in various sizes and styles, including countertop models and built-in versions. They often feature settings for different types of food, such as popcorn or frozen meals. Safety features, like automatic shut-off and child locks, are also common to prevent accidents while using the appliance.