Sometimes refined to just 'pils', a pilsener is a type of pale lager with it's name originating from the city of Pilsen (now Pizen in the Czech Republic).
In 1839, the citizens of Pilsen decided to establish a brewery of their own, called Bürger Brauerei (Citizens' Brewery) and brew beer in accordance with the Bavarian style of the time, including storing the beer in a cool environment and using bottom fermenting yeasts.