s appear in several of the works of Diana Wynne Jones, notably Howl's Moving Castle
et al.), Dark Lord of Derkholm
and Year of the Griffin
, et al.), and the Chrestomanci series
In the Chrestomanci series, "wizard" is one of the classifications of magic-user recognised in World 12A of the Related Worlds.
Wizardry is distinct from witchcraft, magician's magic, sorcery, and enchanter's magic; it is more powerful than basic witchcraft, but less powerful than enchanter's magic.
It is one of the types of magic that requires a lot of artificial aids.