Table wines are used primarily as part of a meal. Tannin A group of organic compounds, which can be found in the wood, stems, fruit skins, and seeds of grapes and other plants. Tannins help to make wines more astringent or mouth puckering. A good way to experience tannin is to bite into a grape or apple seed. That dry, astringent mouth sensation is tannin.
Tannins are especially evident in red wines, and generally help red wines to age.
Once a red wine achieves a certain age, it may throw off its tannins as sediment. This is partly why young wines feature more tannins as sediment. This is partly why young wines feature more tannins and older wines less. Terroir French for soil or earth. Wines produced from grapes grown in certain soils are said to have flavors that are uniquely characteristic of those soils.