There are many wine storage appliances like wine fridges or refrigerators, wine chillers, wine coolers, portable wine cellars, which are just like mini-fridges. The purpose of each appliance is different.
A wine fridge generally refers to a refrigerator, which looks like kitchen refrigerator but particularly designed for storing wine. The special-purpose refrigerators are generally regarded as wine coolers or sometimes portable wine cellars (being self-contained).
A wine fridge generally has accurate temperature settings, proper humidity control, built-in wire shelves particularly for wine bottles, and have a glass in front. It can hold wine bottles from 12 to 100, and consist of separate zones for white and red wines, as they require different settings.
A wine chiller is generally a small, tabletop device for chilling one or two bottles of wine before serving to drink. Usually, they are not designed to use for longer periods of freezing but are used for few hours. For longer storage, a wine cooler or wine fridge or wine cellar is required.
A wine cellar is usually an actual storage place, which can be with or without a cooling unit and humidity control. Sometimes, wine coolers are called wine cellars, which is a marketing term but both are not same. Wine cellars are not self-contained appliances like wine coolers, but they are style built storage areas in a home.
A wine cabinet is usually a fancier wine cooler, quite larger and more decorative than the operative wine cooler. They are used for luxurious home furnishings and are quite expensive.