Major difference between red wine and white wines are that white is fermented without the skins. First the grapes are pressed off the skins and the sweet grape juice is collected in vats to be fermented into wine.
White wines are typically fermented much cooler than red wines
The higher the sugar content of the juice the higher the resulting alcohol level. White wines are also much more susceptible to discoloration (e.g. turn yellow-brown) and don’t commonly cellar as long as red wines.
Rosé happens when the skins of red grapes touch wine for only a short time. Where some red wines ferment for weeks at a time on red grape skins, rosé wines are stained red for just a few hours.