Refrigeration technologies are the ways in which devices such as car refrigerators, fridges, air conditioners, etc. create and maintain cold. There are different types of refrigeration technologies, including compressor, absorption and thermoelectric. Each of these types has advantages and disadvantages and is optimal for different situations. For example, absorption refrigerators are quiet and work great at low voltages, while compressor refrigerators can reach very low temperatures but can be noisier. Thermoelectric refrigerators are generally cheaper and easier to maintain, but cannot reach as low temperatures as the other two types.