In beer, what does the term "Esters" denote?

The term "Esters" refers to aromatic compounds that provide fruity or floral notes in beer. These compounds are formed during fermentation, particularly when yeast metabolizes sugars. Different yeast strains produce varying types and amounts of esters, which can contribute distinct flavors and aromas to the final beer. For example, some common esters such as ethyl acetate lead to aromas reminiscent of apples or pears, while others can give off banana or bubblegum scents.

This characteristic is especially prominent in certain beer styles, such as Belgian ales and many types of ales that utilize top-fermenting yeasts. The presence of esters enhances the complexity and enjoyment of the beer, making them an essential aspect of flavor development in brewing. Understanding esters is vital for evaluating and brewing beers, as they significantly influence the aromatic profile of the finished product.