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The keeping of foods cool for a period of time, geerally so they deteriorate at a slowly speed. This used to be done with ice, but nowadays modern versions of the heat pump invented by William Thomson (later Lord Kelvin) in 1851 - is used in refrigerators.
Elaborations of this system come and gone, and the internal gases now have to be of non 'CFC' chemicals are now less harmful to the environment (the ozone layer in particular).
If you enjoy cooking take a minute to look at ‘Simon Scrutton French Cookery Classes’ on Google – and learn how to make top class bistro-style dishes. Suitable for beginners upwards. Small classes.