How do microwave ovens work

In a microwave oven, food is cooked by exposing it to microwave radiation. Microwaves are a form of radiofrequency (RF) electromagnetic energy. When this energy comes in contact with food, the absorbed energy causes the water molecules in the food to rotate. This movement causes friction between the molecules and produces a rapid rise in temperature. Microwave energy generated by the magnetron is transferred to the oven cavity through a waveguide section (2450 MHz (megahertz) for most conventional ovens). A mode stirrer spreads the microwave energy more or less evenly throughout the oven.