You need a freezer to keep food frozen, but there's a lot of variety in freezers. Stand-alone freezers can be upright or horizontal models, and many freezers are fridge freezers where the refrigerator and freezer are a single unit.
Freezers sometimes come in compact models that tuck away under a counter to save space. Some freezers open from the top, many from the front. Many freezers are self-defrosting and most incorporate energy-saving designs to save money and protect the environment.