The is below is correct,if a little oxford. Basicly yeast
is added to the "container" so that the beer continues to be live ie improve with age. Two basic
types; cask and bottle
conditioned.Cask will see a hand pull/pump used for dispence rather than a font,bottle
condioned will need careful lable reading to identify if you dont know the brand.although there is now a "CAMRA says this real
ale" labling scheme starting to appear,to help the uninitiated.