A refrigeration system is a technology used to remove heat from a designated area, keeping it cool. It works by circulating a refrigerant, a special fluid that absorbs heat, through a series of components including a compressor, condenser, expansion valve, and evaporator. This process allows the system to maintain low temperatures in spaces like refrigerators and freezers. The main purpose of a refrigeration system is to preserve food, medicines, and other perishable items by slowing down the growth of bacteria and other microorganisms. Common applications include household appliances, commercial refrigeration units, and industrial cooling systems, all of which rely on the principles of thermodynamics to function effectively.