All lagers are beers, but not all beers are lagers. In other words, lager is a type of beer. The other general category of beer is ale.
A better question would have been, "What's the difference between ale and lager?" And come to think of it, that question has been asked here. See the related question.
The main differences between ale and lager production are in temperature and type of yeast used. Lager is fermented at a lower temperature than ale and uses a bottom fermenting yeast whereas ale uses a top fermenting yeast.
Pilsner is a style of Lager.
Lager Beer Riot happened in 1855.
The word comes from German as Lager-Bier meaning beer brewed for keeping. (the word lager meaning storehouse and bier for beer) It can be stored for between six weeks and six months
An Irish lager is a beer
Lager is a type of beer that has been fermented using yeast that prefers a cooler temperature than ale yeast. It is made of the same ingredients as beer, namely barley, water, hops, and yeast. The only difference between Lager and Ale is the type of yeast used and the temperatures that it is fermented at. Lagers are a "bottom fermenting" beer that prefers cooler temperatures. Ales are "top fermenting" beers that prefer warmer temperatures.
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Budweiser is an American style lager. It's not a traditional lager, due to the use of rice in the brewing process, but it is nonetheless, a lager. Definitely not an ale.
Yes, it's a Mexican beer
Pilsner is a variety of lager. Other varieties include bock, dunkel, and Oktoberfest/Maerzen. Lagers are made using bottom fermenting yeast at relatively cool temperatures over relatively long periods of time, while ales are made using top fermenting yeast at warmer temperatures over less time. For a good and entertaining little history of pilsner, see http: //beer.about.com/od/lager/a/PilsnerHistory.htm
Lager is one of the two major styles of beer, the other being ale.
Yuengling Lager