Refrigeration is the process of keeping food cold, typically by using refrigerants. Refrigerators are classified according to the size of the unit and their intended use: refrigerator-freezers (which can hold either fresh or frozen foods), mini-fridges (<25 cubic feet), regular or upright freezers (30-50 cubic feet), deep freezers (>50 cubic feet).
Parts are components that make up machines and other devices. They may be individual parts or assemblies that come together to form an entire machine, device, system, assembly, or subsystem.