In the early 1970s CAMRA coined the term 'real ale' to make it easy for people to differentiate between the bland processed beers being pushed by the big brewers and the traditional beers whose very existence was under threat.
Many pubs and brewers use the term to describe their beers, but, just to keep you confused, they are also called cask beers, cask-conditioned ales or even real beer! In the pub the huge majority of real ales are served using traditional hand-pulls, rather than through modern fonts, but there are some exceptions to this, so if in any doubt, just ask. Real ales may also be served direct from the cask, often called gravity dispense.
What makes real ale 'real'?
Real ale is a natural product brewed using traditional ingredients and left to mature in the cask (container) from which it is served in the pub through a process called secondary fermentation. It is this process which makes real ale unique amongst beers and develops the wonderful tastes and aromas which processed beers can never provide.
SOURCE: Read the full story at CAMRA