What are the standard items used in a refrigerator?

There are numerous things that could be stored safely in a refrigerator.  Actually the concept of refrigerator work to lesser down the temperature artificially as the electric elements on a box made it chill inside. So whatever you will put inside the box will not change its taste as whatever is eatable, it gets spoils at high temperature. Reason:  Bacteria in food gets increased rapidly in the temperature of 40 degree to 140 degree. That's the reasons specially all food items, eatables and even medicines required to be refrigerated.