Well sort of. It's not like what you would see in movies. See back in the day, be for science was so widely popular. if you did anything strange, weird or unusual. It was black magic or witch craft and maybe just maybe you where ether a demon or posed by one. Now we know that mixing powders together and setting it a light so that it can burn blue or pink isn't that "bad" is just chemistry. There is however people that believe that they can move stuff with words or cast a curse maybe even talk to a demon or Satan himself. So far black magic and wight magic, well any kind of magic really, is yet to be proven real and effective (that is works). There is how ever something called "science magic". where science is used to impress and in awe a crowd or just some friends. Here are some you can try out. http://chemistry.about.com/od/chemistrymagic/tp/sciencemagictricks.htm
Yes, it DOES exist and it can be very dangerous. I formerly had the misfortune of living next door to a couple who practiced witchcraft. It would take a while to explain it all, but I must say that the two years I lived next door were the most terrifying and dark times of my entire life. And I'm in my 50's. Don't even go there. It's demonic. If you seek darkness it will see you, and you'll wish you hadn't opened that door. It's NOT science. It's spiritual in nature. I've lived it.
No magic exists, black or white. So called 'magic' works only in the minds of those who think it does. Those who expect to see something see what they want to see but no one else is effect because its pretend.
You should learn more about magic and what it is before asking that question because there are a lot of different views on what magic, good or bad, actually is. In wiccan belief magic is a gift given by the goddess (correct me if im wrong). and whatever you do with it affects your karma accordingly. whoever casts a spell will have that karma return to them three fold. a spell meant for harm will harm the caster three fold.