Wine is an alcoholic drink made from fermented grapes. Yeast consumes the sugar in the grapes and converts it to ethanol, carbon dioxide, and heat. Different varieties of grapes and strains of yeasts produce different styles of wine. These variations result from the complex interactions between the biochemical development of the grape, the reactions involved in fermentation, the terrior, and the production process.
The red-wine production process involves extraction of colour and flavour components from the grape skin. Red wine is made from dark-colour grapes varieties. The actual colour of the wine can range from violet, typical of young wines, through red for mature wines, to brown for older red wines..
White wine Fermentation of the non-colour grape pulp produces white wine. The grapes from which white wine is produced are typically green or yellow. Some varieties are well-known, such as the Chardonnay, Sauvignon, and Pinot.
Rosé wine A rosé wine incorporates some of the colour from the grape skins, but not enough to qualify it as a red wine. Rosé wines can be made still, semi-sparkling, or sparkling, with a wide range of sweetness levels.