Craftsmanship is defined by the skill level a person has achieved in their chosen trade. It is a culmination of the practice and creativity of an individual maker.
Quality craftsmanship can also be seen as a reflection of choices in materials used. Just like various courses presented at a meal are enhanced by the quality of ingredients used, high quality craftsmanship is also a matter of choosing the best materials for the job.
Think about framers as one example. When putting up an interior wall, a skilled framer will examine every 2 x 4 to make sure it is not twisted. Twisted 2 x 4s will create problems for the tradespeople who come after the framers, and leave a warped wall. A true craftsperson will start with good 2 x 4s to build the best and straightest wall possible.