Magic and such
That wikipedia definition of Wicca someone posted is pretty much accurate. The word Wicca essentially means witch. The modern sects calling themselves Wiccans are typically a new age take on ancient pagan traditions and the more shamanistic and superstitious side of magic. There are many different orders that practice different types of magic, other than wiccans.
In Buffy, the types of magic that were pracitced most closely resembled Wicca, though of course it was quite a bit more theatrical. There were hints of other forms of magick as well, Demonology of course, and Ethan Rayne claiming to be a Chaos magician. Although the magic he practiced really didn't have anything to do with true Chaos Magic, but I won't go into that.
I know there are some of you out there that think all this magic talk is hogwash, and that is your own opinion, and I respect that, so let's just leave it at that. I'm not telling anyone to believe in any of this, just informing you of some of the beliefs and how it relates to what was portrayed on the show. I'm sure that anyone that logs on here has there own opinion on these things, and this isn't the place for debate on spiritual beliefs.
Anyway, as for the shows, despite the fact that the magic was quite different from true magic, that aspect did have to do with part of my own interest in the show, along with the whole paranormal side of things. Of course as I continued to watch I began to admire it more for it's talented writing, character development, continuity, acting, and the underlying themes in the stories.