No, a porter is not a lager. A porter is a dark-colored beer made with roasted malt and hops that originated in England in the 18th century. It has a fuller body and higher alcohol content than most lagers. Lagers are bottom-fermented beers that are light to medium bodied with lower alcohol content and milder hop flavor than ales or porters. They also have cleaner flavors due to their longer fermentation process at cooler temperatures.