A reefer is a refrigerated container or truck used to transport temperature-sensitive goods, such as fresh food, frozen food, beverages, or pharmaceuticals. These containers are equipped with a built-in refrigeration unit to maintain a specific temperature range, ensuring that the cargo stays fresh or preserved during transit. In shipping, reefer containers are essential for the safe transport of perishable items, preventing spoilage and ensuring that products arrive at their destination in optimal condition. The term “reefer” can also refer to the refrigerated trucks used for similar purposes in land-based logistics.