What's the difference between black magic and white magic? Magic, really, doesn't have any color, but we give it colors to categorize by intent.
We identify Black Magic, as "evil" magic. It can be used to harm someone. To curse, cause bad luck or misfortune on others, are examples.
We identify White Magic, as "good" magic. They don't harm anyone, and can aid in healing, and be used for good luck.
Though it's a short article, this is only to describe the difference between the two categories.