What grape variety is known for producing wines with high tannin levels?

Cabernet Sauvignon is recognized for producing wines with high tannin levels due to its thick grape skins and the structure of its fruit. Tannins contribute to the wine's astringency and aging potential, giving it a robust character. This grape variety is often used in full-bodied red wines and is popular for its ability to produce complex flavors, as well as for its capacity to age well over time due to those high tannin levels. The high tannins in Cabernet Sauvignon can also lead to greater stability and longevity when stored properly.

In contrast, Chardonnay, Riesling, and Pinot Grigio are white grape varieties that typically exhibit lower tannin levels, as white wines are generally made without the grape skins, where most tannins reside. Chardonnay and Riesling focus on acidity and fruit character rather than tannin structure, while Pinot Grigio showcases a lighter, crisper profile that is also low in tannins.