Beer style is a term used to differentiate and categorize beers by various factors, including appearance, flavour, ingredients, production method, history, or origin. The term beer style and the structuring of world beers into defined categories is largely based on work done by writer Michael James Jackson in his 1977 book The World Guide To Beer. Fred Eckhardt furthered Jackson's work, publishing The Essentials of Beer Style in 1989.
There is no universally agreed list of beer styles, as different countries and organisations have different sets of criteria. Organisers of beer competitions such as the Campaign for Real Ale's (CAMRA) Champion Beer of Britain, the Beer Judge Certification Program (BJCP) local homebrewing competitions, the Brewers Association's World Beer Cup, and the Brewing Industry International Awards have categories in which beers are judged. The categories are varied and include processes or ingredients not usually regarded as defining beer styles in themselves, such as cask ale or gluten-free beer.
Beer terms such as ale or lager cover a wide variety of beer styles, and are better thought of as broad categories of beer styles. A number of ethnic beers, such as chhaang and cauim, are generally not included on beer style groupings.
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