Witchcraft is a particular tradition, or type of Magick. While there are many types of magick that fit the definition of "witchcraft"; most are descended from religions that are pagan in origin. Witchcraft typically involves supplication of various entities (spirits, elementals, deities, etc) to create the desired effect. Witchcraft tends to deal less with hard/fast rules than some other traditions, such as Western Hermeticism or Egyptian heka.