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One of the most commonly used tools in refrigeration technology is a freezer. A refrigerator is a device that is able to remove heat from the interior, reducing the temperature of the interior space and keeping it below the ambient temperature. Freezers come in many sizes and shapes, from home freezers to industrial refrigerators or walk-in freezers.

Refrigerators operate according to refrigeration cycles consisting of compression, condenser, expansion and evaporation stages. During the refrigeration cycle, the heat pump transfers heat from the refrigeration space to the condenser, where it is released to the environment. This causes a decrease in the temperature in the interior space, allowing the freshness of the product to be maintained for a long time. In addition to freezers, refrigeration techniques include other tools such as cold tunnels, cold chambers, or a refrigerant such as liquid nitrogen or liquid carbon dioxide. These methods and tools are used to reduce the temperature of the product faster or reach very low temperatures that cannot be achieved using only the freezer method.