Wine is an alcoholic beverage made by fermenting grapes or other fruits without added sugars, acids, enzymes or nutrients. It is produced using various types of yeast that convert the sugars in grapes into alcohol. The document discusses the history of winemaking around the world, important wine regions like Rioja and Ribera del Duero in Spain, wine classification systems indicating quality and aging, the winemaking process, and the top 10 wine producing countries with Italy being the largest producer.