The main purpose of a refrigerator is to preserve food and beverages by maintaining a low temperature. Refrigeration slows down the growth of microorganisms, such as bacteria and mold, that can spoil food. By keeping perishable items like dairy, meats, and produce cold, refrigerators extend their shelf life and maintain their nutritional quality. Most refrigerators work by using a compressor and refrigerant to remove heat from the interior, ensuring a consistently cool environment. This technology allows people to store food safely for longer periods, thus reducing waste and ensuring food safety.