What is the Twin Cooling System featured in some Samsung fridge-freezers?

The Samsung Twin Cooling System is a cooling technology available on some side-by-side models that uses two evaporators and two fans to maintain the refrigerator and the freezer compartments completely independent of each other. This allows you to control the temperature of both the refrigerator and the freezer. It is driven by a single compressor to supply the optimum level of air-cooling.

The freezer air stays dry and the fridge air stays humid so that the food is kept in peak condition. It also prevents odours from being transferred between compartments.