As the name suggests, a cold room is a room that has a lower temperature than normal. It is a room that is insulated and set to be a certain temperature. There are lots of reasons that a cold room could be used, but generally speaking they are used when a standard refrigerator just isn’t up the job.
Usually it is business premises that have access to cold rooms rather than people having one at home but that doesn’t always have to be the case. If you have a need (or want) to keep a large number of items chilled then a cold room could be exactly what you are looking for.