What characteristic does "Brettanomyces" contribute to beer?

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Brettanomyces is a type of yeast known for its unique fermentation characteristics that contribute distinctive flavors and aromas to beer. When Brettanomyces is present in the fermentation process, it often produces sour and funky notes, which are highly valued in certain styles of beer, particularly in Belgian ales and sour beers. These flavors can include barnyard, earthy, and fruity qualities that create complexity and depth in the final product.

This characteristic sets Brettanomyces apart from other yeasts that might impart cleaner or more traditional fermentation profiles, leading to the crisp and clean flavors typically associated with standard lagers. Additionally, Brettanomyces does not contribute sweetness or body in the same way that traditional brewing yeasts might; instead, it often produces a more tart beer profile. Therefore, its contribution of sour and funky notes is significant and sought after in various craft beer styles.