The acidity level in a wine is critical to its enjoyment and livelihood. The natural acids that appear in wine are citric, tartaric, malic, and lactic. Wines from hot years tend to be lower in acidity, whereas wines from cool, rainy years tend to be high in acidity. Acidity in a wine can preserve the wine's freshness and keep the wine lively, but too much acidity, which masks the wines flavors and compresses its texture, is a flaw.