What are Hops primary use for in beer?

Hops have many uses in commercial brewing. The most common use is to provide bitterness to balance the sweet taste provided by the grains/malts.

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Hops are added at two times during the brewing process (usually). Early in the boil for purposes, and late in the boil for aroma. There is also a process called dry hopping in which hops are added during fermentation to increase the hop profile of the beer.

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Hops are also used as a preservative.