Anti-bacterial coating - fridges with this on their walls, shelves or door are protected against bacterial growth, creating a more hygienic atmosphere for food.
Anti-bacterial filter - these eliminate potentially harmful bacteria, mildew and mould spores from the air. Filters need to be changed on average every 6 months.
Auto-defrost - this means that the fridge defrosts itself, so you won't have to. Larder fridges usually have auto defrost, but if your fridge has an ice-box, you'll still need to defrost it.
Berry tray - designed for freezing soft fruit individually so they don't stick together, these trays are great if you're into home baking or blending.
Cool zones - some fridges have different temperature zones, for different types of food. For example, you may find a fridge with a cool zone for meat, fish or poultry.
Door balconies - these vary greatly in fridges, but usually include room for bottles, cartons or dairy goods.
Door seals - these insulate the freezer or fridge, and may be magnetic and removable for easy cleaning.
Fast freeze - freezes newly added food quickly, so the ambient temperature of the freezer isn't raised. It helps to preserve taste and quality, and some models have an automatic fast freeze that switches on if the temperature becomes too high.
Frost free - freezers with this feature freeze food without forming ice crystals, ensuring better taste as well as nutritional content. You'll never have to defrost an appliance with this feature.
Humidity control - this is usually applied to the salad crisper drawer inside fridges, and helps keep vegetables fresher for longer.
Ice-dispenser - these offer crushed or cubed ice, and are situated in the door of your freezer, with access to it from the exterior of the unit - so you don't have to open the door.
Pizza box - found in some freezers, these are made for pizzas and ready meals, and help free space in the main storage compartments.
Shelving - in fridges, this is either wire grid or glass. Safety glass is more expensive, but will contain spills and drips that might contaminate food, holding up to a pint of liquid before they drip. They're easy to wipe clean and won't shatter when broken.
Some models come with a wine rack or bottle holder, and most fridges have an egg rack and dairy compartment.
Thermometer - this lets you monitor the temperature of your fridge or freezer. Top of the range models usually have this on the outside, complete with temperature controls - so you don't have to open the door to adjust it.
Water dispenser - some models offer filtered water, others offer water straight from your mains system. Some models operate off bottled water, while others require plumbing in to within one metre of your mains supply.
6th Sense - this is a form of temperature control, that restores the original temperature of the fridge after the door has been opened.