Adepts are found across Azeroth. They are of various races and organizations.
In the RPG
Adepts are generally spell casters in training to become members of other more experienced spell caster classes. For example, shamans and witch doctors teach their skills to new adepts. However, this is not always the case as sometimes an adept is a spell caster who specializes in a single school of magic. An arcane adept is a dedicated mage with a natural predilection for one of the schools of specialization (usually transmutation or ). They become more entrenched in whichever school they prefer.