What are the different types of beer and how are they different?

Lager, ale, mild ale, bitter, stout, Irish stout, imperial stout, oatmeal stout, milk stout, porter, whiskey porter, barley wine, pilsener, bock, duppel bock, trippel bock, pale ale, India pale ale, weissbier, heffeweissen, Krystalweissen, lambic, kriek, schwarzbier, Vienna lager, trappist ale, steam beer, rauchbier.