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Sour beer is a type of beer that has a tangy, acidic flavor profile due to the presence of wild yeast strains and bacteria during the fermentation process. This style of beer can range from mildly tart to intensely sour, with complex fruity and funky notes that are often reminiscent of vinegar or sour fruits. Sour beers are typically aged for an extended period of time in wooden barrels to develop their unique flavors, and they can be brewed using a variety of different techniques and ingredients, such as fruit additions or mixed fermentation.