craft, for me, came about from small brewers who wanted to make nice tasting beer by experimenting and fucking about with hops and all that, then producing it on a small scale, with the focus on perfecting the flavour, not just mass produced shite
though some craft beers like sierra nevada and lagunitas became popular and mass produced
it's ambiguous though, with many different interpretations, which allows greene king to knock out stuff under the craft banner that a few years ago would in no way be considered craft
theres a craft beer network on facebook and it's full of cocks trying to out craft each other in their opinions and knowledge on the matter, so basically, trying to be an expert in it will probably turn you into a cunt
so just drink and enjoy, but with an appreciation of the work that's gone into producing a nice tasting ale, which you probably don't get with lagers and that