Orange wine - is not wine made from oranges. Orange wine is wine made from white wine grape varietals that have spent some maceration time in contact with the grape skins.
Typically white wine production involves crushing the grapes and quickly removing the juice off the skins into fermentation tanks or vats. The grape skins contain colour pigment, phenols and tannins that are often considered undesirable for white wines - while for red wines, skin contact and maceration is a vital part of the winemaking process that gives red wines its colour, aromas, flavour, texture, character and finish.
Orange wines get their name from the darker, slightly orange tinge that the white wines receive due to their contact with the colouring pigments of the chosen grape skins.

 

These are white grapes are left to ferment and exposed to subtle oxidation (with little or no sulphur), giving them a colour that verges on the orange, pale honey colour.
This winemaking style is essentially the opposite of 'rosé' production which involves taking red wine grape juice quickly off their skins, leaving the wine with a slightly pinkish hue. However in the case of Pinot Gris, among one of the more popular grape varietals chosen to apply slight skin-contact treatment that is neither red nor white. The diffuse nature of the term becomes illustrated, as both an orange wine and a rosé might achieve a similar expression of pink/orange/salmon-coloured wine.
The practice has a long history in winemaking dating back thousands of years to the Eurasian wine producing country of Georgia. In recent years the practice has been adopted by Italian winemakers, initially in the northen Friuli-Venezia Giulia wine region, while there is also production in countries like; Slovenia, Croatia, France, Germany, California, Australia and also New Zealand to name a few.
Orange wines were not uncommon in Italy in the 1950's and 1960's, but gradually became rare as technically correct and fresh-bright white varietal wines came to be more widely enjoyed on the local and international market. NB: once open, they age very quickly.