Well, in the first place, I would advise you to look the two words up in a good dictionary, or to put them into Google, and click on the definition link at the top of the results page. However, generally the historic distinction was that "art" is concerned mainly with creating beauty; whereas "craft" is concerned with displaying technical skill. However, there is clearly a link beteen the two, and in modern times the distinction has become more and more blurred. For example, Grayson Perry, a potter, won the Turner Prize last year - something which would have been unthinkable some years ago, as he would have been regarded as merely a craftsman. On the other hand, because much modern art seems to lack beauty, though well executed, many people don't see them as true art but simply as craft.