Caster is one of the 4 EverQuest archetypes, along with Hybrid, Melee and Priest.

Casters include enchanters, magicians, necromancers and wizards.

Casters have the weakest armor of all 4 archetypes, this is why they avoid going in melee range unlike melee and hybrid classes. Instead they use powerful spells or pets to fight monsters from a distance. Unlike priests, they can't heal other players.