A reefer container (refrigerated container) is a specialized, insulated shipping container with a built-in refrigeration unit, used to transport temperature-sensitive goods like food, pharmaceuticals, and flowers by maintaining precise chilled or frozen conditions (typically –30°C to +30°C) throughout transit. These units provide consistent temperature, humidity, and air flow, requiring an external power source from ships, trucks, or depots, and are essential for extending the shelf life of perishables globally