A refrigerator with its door open
A refrigerator is a machine used for keeping things cold. It is sometimes called a fridge or an icebox. It is normally maintained at 4-5 degree Celsius for household use. People put food and drinks in it, to keep those items cold or good (unspoiled) for a longer time. A refrigerator has a heat pump which takes heat away from the air inside the fridge. The heat is moved to the air outside. The heat pump is usually driven by an electric motor.
Early electric refrigerator. The heat exchanger is on top. It is in Thinktank,
Birmingham Science Museum.