In legend they are often portrayed as old hags that dabbled in the black arts of magic. They often were dressed in black and were said to even be the brides of the devil. These days witch-craft is being enbraced again but in a much better light. Modern "witches" use magic for healing and good and have nothing to do with the devil. They are the followers of the modern religion of Wicca.
A major subset of the Discworld novels of Terry Pratchett involves the witches of Lancre. They are closely based on witches in British folklore, combined with modern Wicca and a slightly tongue-in-cheek reinterpretation of the Triple Goddess.
Witches is a supernatural comic book miniseries that was published by Marvel Comics in 2004. Plot by Bronwyn Carlton, scripts by Brian Walsh, and art by Mike Deodato and Will Conrad. Original editor: Lysa Hawkins.