it's basically sub-categories of witchcraft. you study Wicca/Witchcraft, but you focus on something specific [kitchen witch, sea witch, hedge witch, eclectic wicca, celtic wicca, seax wicca] but it's just titles, you can call yourself anything if it feels right to you. i've jumped around through several labels in my studies [currently i teeter between 'eclectic' and 'seax wiccan' since my path is closest to seax wicca but there are some eclectic things that are my own]
i'm sure you can google it to get a complete list. is there a specific one you're interested in?