Freezing, i.e. holding a food in a refrigerated environment with the majority of the water in the food turned into ice, is a major preservation method for foods. A frozen food has a ‘safe’ storage and distribution life of years when compared to the days or months of a chilled product. A frozen cold-chain reduces the temperature of the food below a temperature that prevents the growth of any pathogenic, or spoilage, microorganisms and stops it rising during distribution. This article describes the technologies used to produce frozen foods and the role of freezing and frozen storage in food safety.