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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.