Why is it advised to keep them in the refrigerator to increase the shelf life of dairy products?

The refrigerator is one of the most important kitchen equipment for food safety. Refrigeration equipment slows down the growth of bacteria. Bacteria exist everywhere in nature. They are found in soil, air, water, and the food we eat. When they have nutrients (food), humidity and favorable temperatures, they grow rapidly, increasing in numbers to the point that certain types of bacteria can cause disease. The refrigerator will protect most food from bacteria build-up.