I think dryness was definetly covered above, but I wanna add anyhow. Since Abe asked if dryness had a relation to alcohol. Although a dry wine doesnt have to be "high" in alcohol, or the other way around either. A relationship still somewhat exsist, but is basically irrelevant. The sugar ferments to create alcohol, so the wine gets less sweet and higher in alcohol, but finished product depends on how much sugar the wine started with.