Why do we keep food in a fridge?

Food goes bad because bacteria, mould and microbes attack it. This happens more quickly in warm temperature, where as cold interrupts and even stops this process. So food will keep fresh for longer in a fridge.
Nowadays, there are enormous refrigerated rooms, fro string meat and vegetables which can then be eaten in perfectly good condition at any time of year. The technique of keeping foods refrigerated is most important in transporting fish from the sea to the markets where they are sold.